Robust Cementitious coating

Robust RC-7 Seal Cementitious Coating

Introduction

RC-7 Seal Cementitious Coating is a premium two-component polymer-modified waterproof coating developed by Robust Construction Chemicals for high-performance protection of concrete and masonry surfaces. It provides an impenetrable barrier against water, moisture, and chemical intrusion, ensuring long-term durability of structural components. Designed with advanced polymer technology and cementitious binders, RC-7 Seal forms a flexible, dense, and durable waterproof layer ideal for roofs, basements, water tanks, retaining walls, and concrete structures exposed to hydrostatic pressure.

In modern construction, water infiltration is among the most significant causes of structural damage, corrosion of reinforcement steel, and surface degradation. RC-7 Seal Cementitious Coating effectively resolves these issues through its unique blend of polymer binders, high-reactive cementitious fillers, and proprietary additives. When applied, it forms a seamless coating that adheres strongly to both positive and negative pressure sides of the substrate.

Product Description

RC-7 Seal is a two-component polymer-cement-based coating system.

  • Component A: A specially formulated liquid polymer emulsion that provides flexibility, adhesion, and durability.

  • Component B: A blend of high-grade Portland cement, fine silica fillers, and proprietary waterproofing additives.

When mixed together, these components form a slurry that can be applied with a brush, roller, or spray. Upon curing, the coating develops a dense, impermeable, and crack-resistant film that provides long-term protection against moisture ingress, carbonation, and mild chemical attack.

Key Features and Benefits

  • Superior Waterproofing: RC-7 Seal creates an impermeable membrane that resists positive and negative water pressure.

  • Excellent Adhesion: Bonds strongly to concrete, plaster, and masonry surfaces.

  • Flexible and Crack-Resistant: Polymer modification enhances flexibility, preventing cracks due to thermal and structural movements.

  • UV and Weather Resistant: Suitable for internal and external applications.

  • Chemical Resistance: Protects against mild acids, chlorides, and sulfates.

  • Eco-Friendly: Water-based, non-toxic, and environmentally safe.

  • Improves Durability: Extends the life of structures by protecting reinforcement and minimizing carbonation.

  • Easy to Apply: Can be brushed, troweled, or sprayed with standard tools.

Technical Data and Physical Properties

Property Test Method / Description RC-7 Seal Value
Appearance Component A: Milky white liquid
Component B: Grey powder		 –
Mixing Ratio A : B = 1 : 2.5 by weight –
Pot Life Approx. 45 minutes at 25°C –
Density of Mixed Material 1.85 ± 0.05 g/cm³ –
Application Temperature 5°C to 40°C –
Curing Time 24 hours touch dry, 7 days full cure –
Thickness (2 coats) 1.0 – 1.5 mm –
Bond Strength (ASTM D4541) ≥ 1.5 N/mm² Excellent
Elongation at Break > 20% Flexible
Water Penetration (DIN 1048) Nil up to 7 bar Impermeable
Crack Bridging Ability Up to 0.4 mm Excellent
Chemical Resistance Mild acids, salts, chlorides Resistant

Chemical Behavior and Mechanism

RC-7 Seal’s waterproofing performance is based on synergistic chemical bonding between polymer chains and cement hydration products. When the two components are mixed, hydration of cement forms calcium silicate hydrates (C-S-H gel), which fill pores and capillaries within the concrete matrix. Simultaneously, the polymer emulsion coalesces into a continuous film, binding the hydrated cement crystals and forming a flexible waterproof network.

The chemical mechanism involves:

  • Polymer-Cement Interaction: The polymer particles penetrate the capillaries and pores, forming a cohesive matrix with the cement hydrates.

  • Capillary Blocking: The fine fillers and polymer phase reduce permeability by physically blocking water paths.

  • Film Formation: During curing, the polymer film develops a dense, elastic layer that accommodates minor substrate movement.

  • Hydrophobic Enhancement: Certain additives introduce hydrophobic groups (such as silane/siloxane-based modifiers) that repel water molecules.

This dual-action — crystalline densification from cement hydration and film-forming polymerization — results in an impermeable yet flexible waterproof layer, making RC-7 Seal a superior choice for both positive and negative side waterproofing.

Areas of Application

          RC-7 Seal Cementitious Coating is designed for a broad range of waterproofing and protective applications:

  • Roof slabs and terraces

  • Bathrooms, toilets, and wet areas

  • Basement walls and foundations

  • Water tanks and reservoirs (potable water safe)

  • Retaining walls and lift pits

  • Swimming pools and water features

  • Bridge decks and culverts

  • Tunnels and underpasses

  • Balconies and podium decks

  • Sealing internal damp walls prior to painting

Its adaptability and strong adhesion make it suitable for new construction, maintenance, and refurbishment works.

Surface Preparation

  1. Cleaning: Remove dirt, dust, grease, loose particles, laitance, and previous coatings using mechanical methods or wire brushing.

  2. Repair: Fill cracks or honeycombs using Robust Repair Mortar or RC Leak Fix Admixture.

  3. Pre-Wetting: Dampen the surface thoroughly with water, ensuring it is saturated surface dry (SSD) before applying the coating.

  4. Priming (Optional): For highly porous surfaces, apply a primer made of RC-7 Seal liquid polymer diluted with water (1:1) to improve adhesion.

Mixing Instructions

  1. Pour Component A (liquid polymer) into a clean container.

  2. Gradually add Component B (powder) while stirring continuously using a low-speed mechanical mixer (400–600 rpm).

  3. Mix for 3–5 minutes until a smooth, lump-free slurry is obtained.

  4. Allow the mix to stand for a few minutes to release entrapped air.

  5. Use the mixture within 45 minutes of preparation.

Application Procedure

  1. First Coat: Apply the first coat of RC-7 Seal using a brush or roller on the pre-wetted surface. Work the material into pores and corners.

  2. Second Coat: After 4–6 hours (when the first coat is touch-dry), apply the second coat at right angles to the first for uniform coverage.

  3. Protection: Allow the coating to cure naturally for 24 hours. Protect it from direct sunlight, rain, or frost during curing.

  4. Final Curing: Light mist curing with water after 24 hours enhances coating performance.

  5. Optional Protection Layer: For exposed surfaces, apply a protective screed or tile finish after full curing.

Coverage

Surface Type Typical Coverage (2 coats)
Smooth Concrete 1.5–2.0 kg/m²
Rough Masonry 2.5–3.0 kg/m²

Coverage depends on substrate texture, porosity, and wastage.

Advantages of RC-7 Seal Cementitious Coating

  • Long-lasting waterproof barrier for concrete and masonry

  • Protects steel reinforcement from corrosion and carbonation

  • Provides crack-bridging flexibility up to 0.4 mm

  • Breathable coating – allows moisture vapor transmission while blocking liquid water

  • Compatible with tile adhesives, plaster, and paint finishes

  • Can be used for potable water tanks (non-toxic, chloride-free)

  • Reduces maintenance costs and enhances structural lifespan

  • Excellent resistance to freeze-thaw cycles and thermal variations

  • Ideal for both interior and exterior waterproofing systems

Storage and Shelf Life

  • Store RC-7 Seal in a cool, dry place away from direct sunlight and moisture.

  • Keep the containers tightly closed.

  • Shelf life: 12 months from the date of manufacture if unopened.

Health and Safety

  • Avoid contact with skin and eyes.

  • Use protective gloves, masks, and goggles during mixing and application.

  • In case of contact, rinse with clean water immediately.

  • Ensure adequate ventilation during use.

  • RC-7 Seal is non-toxic and non-flammable but should not be ingested.

Packaging

  • Component A (Liquid Polymer): 10 kg, 20 kg cans

  • Component B (Powder): 25 kg, 40 kg bags

  • Recommended Mix Pack: 30 kg set (10 kg liquid + 25 kg powder)

Quality Assurance and Compliance

RC-7 Seal Cementitious Coating is manufactured under stringent quality controls by Robust Construction Chemicals. It conforms to the following standards:

  • ASTM C836 – Liquid-Applied Waterproofing Materials

  • DIN 1048 – Water Permeability Test for Concrete

  • BS EN 14891 – Liquid-Applied Waterproofing Products for Tiles and Floors

Quality testing includes adhesion strength, flexibility, permeability, and chemical resistance verification in accordance with Robust’s ISO 9001 quality management system.

Troubleshooting and Common Application Tips

Issue Possible Cause Solution
Poor adhesion Surface not cleaned or primed properly Ensure SSD condition and clean surface
Cracks in coating Applied too thick or under direct sun Apply in recommended thickness and protect during curing
Blistering Application over non-dry surface Allow surface to dry surface-saturated (not wet)
Uneven texture Inconsistent mixing Use low-speed mechanical mixer for uniform slurry

Environmental and Sustainability Aspects

RC-7 Seal is formulated using water-based polymers, minimizing VOC emissions and environmental impact. It does not contain hazardous solvents or chlorinated compounds. The product aligns with green building standards (LEED, IGBC) and contributes to sustainable construction by reducing maintenance and increasing the service life of structures.

Conclusion

RC-7 Seal Cementitious Coating is a scientifically formulated, reliable waterproofing system that combines the durability of cement with the flexibility of modern polymers. Developed by Robust Construction Chemicals, it delivers outstanding protection against water ingress, carbonation, and chloride attack. Whether for new construction or restoration projects, RC-7 Seal ensures long-term waterproof integrity, strength, and aesthetic preservation of concrete and masonry structures.

By providing a balance between cost-efficiency and performance, RC-7 Seal stands out as a professional-grade waterproofing solution for engineers, contractors, and builders seeking durable, eco-friendly protection.

Cementitious coating is a popular solution in the construction industry, renowned for its versatility and effectiveness in enhancing the durability of structures. It is a blend of cement-based materials and specialized polymers, designed to protect and waterproof surfaces while improving their longevity. This guide explores the benefits, applications, and installation process of cementitious coatings, making it an ideal reference for homeowners, builders, and professionals in the construction field.

What is Cementitious Coating?

Cementitious coating is a thin layer of cement-based material applied to surfaces to provide protection against water, chemicals, and environmental wear. It is commonly used on concrete and masonry surfaces to enhance their durability and aesthetic appeal. The coating forms a durable, seamless barrier that prevents moisture penetration, thus reducing the risk of damage caused by water and other external factors.

This coating is available in two types: rigid and flexible. While rigid coatings are ideal for surfaces that do not experience significant movement, flexible coatings can accommodate minor structural shifts, making them suitable for areas prone to vibrations or settling.
Cementitious coating is a type of waterproofing or protective coating made primarily from cement-based materials. It is commonly used to protect structures like concrete surfaces, tanks, roofs, basements, and retaining walls from water ingress, chemical attacks, and wear.
Key Features:
Waterproofing: Creates a barrier to prevent water penetration.
Durability: Resists harsh environmental conditions.
Breathability: Allows vapor to escape while blocking water.
Ease of Application: Applied using a brush, trowel, or sprayer.
Applications:
Waterproofing of rooftops, bathrooms, and swimming pools.
Protection of concrete in water tanks, sewage systems, and pipelines.
Coating for basements and underground structures.

Key Benefits of Cementitious Coating

Waterproofing
Cementitious coatings create an impermeable layer that prevents water from seeping into surfaces. This makes them an excellent choice for basements, swimming pools, water tanks, and other structures exposed to moisture.

Durability
These coatings significantly enhance the lifespan of concrete and masonry surfaces. They protect against wear and tear caused by weather, chemicals, and mechanical stress.

Ease of Application
Cementitious coatings are relatively easy to apply. With proper preparation, even individuals with basic construction knowledge can achieve professional results.

Cost-Effective
Compared to other protective solutions, cementitious coatings are affordable while delivering exceptional performance. Their long-lasting nature further reduces maintenance and repair costs.

Versatility
Suitable for both interior and exterior applications, cementitious coatings can be used in residential, commercial, and industrial projects. They are compatible with various substrates, including concrete, brick, and stone.

Aesthetic Enhancement
Available in different finishes and colors, these coatings allow for customization, enabling architects and designers to achieve their desired visual effects.

Common Applications

Water Tanks and Reservoirs
Cementitious coatings are widely used to line water storage structures, ensuring they remain leak-proof and resistant to microbial growth.

Basements and Foundations
By preventing water ingress, these coatings protect basements and foundations from dampness, mold, and structural damage.

Bridges and Tunnels
The coating’s resistance to harsh environmental conditions makes it ideal for infrastructure projects like bridges and tunnels.

Swimming Pools
Cementitious coatings create a smooth, waterproof surface for swimming pools, reducing the need for frequent repairs.

Industrial Floors
In factories and warehouses, these coatings enhance floor durability and resistance to chemicals and abrasion.

Balconies and Rooftops
The coating prevents water penetration, preserving the integrity of exposed structures like balconies and rooftops.

Installation Process

Applying cementitious coating involves several steps to ensure optimal performance. Here’s a detailed overview of the process:

Surface Preparation

Clean the surface thoroughly to remove dirt, grease, and loose particles.

Repair any cracks or holes using appropriate patching materials.

Ensure the surface is slightly damp but free of standing water.

Mixing

Follow the manufacturer’s instructions to mix the cementitious coating material. Typically, the mix consists of a dry powder and a liquid polymer.

Use a mechanical mixer for a uniform consistency.

Application

Apply the first coat using a brush, roller, or spray gun, ensuring an even coverage.

Allow the first coat to cure as per the manufacturer’s recommendations.

Apply a second coat perpendicular to the first for better coverage and strength.

Curing

Proper curing is essential to achieve the desired properties of the coating. Keep the surface moist during the curing period to prevent premature drying.

Final Inspection

Check the coated surface for any imperfections or missed spots.

Address any issues promptly to ensure complete protection.

Maintenance and Longevity

Cementitious coatings are low-maintenance, requiring minimal effort to keep them in good condition. Regular inspections can help identify and address minor issues before they escalate. Cleaning the surface with mild detergents and avoiding harsh chemicals can also prolong the coating’s lifespan.

Under proper conditions, cementitious coatings can last for decades, making them a reliable and sustainable choice for construction projects.

Choosing the Right Cementitious Coating

Selecting the appropriate coating depends on several factors, including:

Application Area

Consider whether the coating will be used indoors or outdoors, as well as the type of substrate.

Environmental Conditions

Assess the exposure to water, chemicals, and temperature variations.

Flexibility Requirements

Determine if the structure requires a rigid or flexible coating.

Manufacturer’s Reputation

Opt for products from reputable manufacturers with proven performance records.

Environmental Impact

Cementitious coatings are environmentally friendly compared to some other protective solutions. Many formulations are free from harmful chemicals, making them safe for use in potable water systems. Additionally, their durability reduces the need for frequent replacements, minimizing waste.

1. Product Functionality in Depth

RC-7 Seal Cementitious Coating functions as a reactive waterproof membrane that integrates with the concrete substrate to form a durable barrier. The chemical bonding between the polymer and the hydrated cement particles creates a semi-flexible composite layer capable of resisting both positive (external water pressure) and negative (internal dampness) water ingress.

The polymer component forms a film network, while the cementitious phase contributes mechanical strength and chemical stability. The coating seals micro-cracks, reduces porosity, and maintains breathability — allowing vapor diffusion without letting water molecules penetrate.

The result is a hybrid waterproof film that behaves like an integral part of the structure rather than a superficial layer.

2. Chemistry Behind the Coating

When Component A (polymer emulsion) and Component B (cementitious powder) are mixed, the hydration process begins immediately.

  • Cement hydration forms calcium silicate hydrate (C-S-H) and calcium hydroxide crystals.

  • The polymer emulsion coalesces, forming long-chain molecular bridges across pores.

  • This results in a continuous, interlocked network that is flexible and dense.

Key Chemical Interactions

  • Polymer–Cement Compatibility: The latex polymer is designed to interact chemically with hydrated lime, enhancing cohesion.

  • Capillary Blocking: Micro-particles fill voids within the cement matrix, reducing permeability by up to 95%.

  • Film Formation: The polymer film remains elastic even after full curing, providing flexibility to absorb minor movements or shrinkage.

  • Hydrophobic Enhancement: Silicone or silane-based additives modify surface energy, repelling water molecules while maintaining vapor diffusion.

This mechanism ensures that the RC-7 Seal coating behaves as both a physical barrier and a chemically bonded hydrophobic layer, making it ideal for waterproofing structures exposed to cyclic wetting and drying.

3. Advanced Application Instructions (Professional Site Guide)

Step 1 – Substrate Inspection

Before application, inspect the concrete surface thoroughly. Look for:

  • Cracks larger than 0.3 mm

  • Honeycombing or segregation

  • Leaking joints or expansion gaps

  • Contaminants such as oil, grease, formwork release agents

All defects must be repaired using Robust Repair Mortar or Leak Fix Admixture before applying RC-7 Seal.

Step 2 – Moisture Check

The substrate should not have standing water. However, a slightly damp surface ensures better adhesion.
Avoid application on bone-dry or waterlogged substrates.

Step 3 – Mixing

  • For small quantities, mix manually using a paddle rod.

  • For large projects, use a mechanical drill mixer (400–600 rpm).

  • Always add powder (B) to liquid (A) — not the reverse — to prevent clumping.

  • Continue mixing until a uniform, creamy paste forms.

If spraying, slightly reduce viscosity by adding up to 5% clean water.

Step 4 – Application by Brush

  • Use a stiff bristle brush (nylon or synthetic).

  • Apply two uniform coats, maintaining an even thickness.

  • For horizontal surfaces (like roofs), pour and spread evenly using a roller or notched trowel.

  • Do not apply under strong wind or direct sunlight.

Step 5 – Application by Spray

For large areas (e.g., tanks, retaining walls), an airless spray unit with a 3–4 mm nozzle can be used.
Maintain constant pressure for uniform deposition.

Advantages of spray application:

  • Uniform film thickness

  • Reduced labor time

  • Better coverage on irregular profiles

Step 6 – Reinforcement Layer (Optional)

For areas prone to cracking or movement (corners, joints, parapets), embed fiberglass mesh or geotextile fabric between the first and second coats.
Ensure overlap of at least 50 mm at joints.

Step 7 – Curing and Protection

  • Allow the coating to dry for 24 hours before exposing to moisture.

  • Cure for at least 3 days before backfilling or water testing.

  • For roofs, apply a protection screed (25 mm) after 3 days to protect from UV and abrasion.

Step 8 – Tile or Paint Compatibility

RC-7 Seal Cementitious Coating provides a suitable surface for:

  • Tile adhesive bonding

  • Protective paint layers

  • Decorative coatings
    Ensure full curing before applying finishes.

4. Field Case Studies and Application Scenarios

A. Roof Waterproofing System

Problem:
Concrete roof slabs are highly exposed to sunlight, rain, and temperature variations, causing shrinkage cracks and leakage.

Solution with RC-7 Seal:

  1. Clean and repair cracks using Robust Repair Mortar.

  2. Apply two coats of RC-7 Seal cementitious coating (total 1.5 mm).

  3. After 3 days curing, apply a protective cement-sand screed with slope.

  4. Optionally, finish with RC Roof Shield elastomeric coating for UV protection.

Result:
The roof remains leak-free for over 8 years, withstanding heavy monsoon rains and thermal expansion cycles.

B. Basement Retaining Wall Waterproofing

Problem:
Basement walls often suffer from negative water pressure due to groundwater ingress.

Solution:

  1. Prepare and clean internal basement wall surfaces.

  2. Fill all construction joints with Robust Waterstop or RC Plug compound.

  3. Apply 2 coats of RC-7 Seal from inside the basement.

  4. Allow 7-day curing before backfilling external soil.

Result:
RC-7 Seal’s polymer-cement bond withstands hydrostatic pressure from inside, preventing seepage and dampness.

C. Water Tank Waterproofing

Problem:
Concrete water tanks develop hairline cracks due to thermal and shrinkage stress, causing leakage.

Solution:

  1. Empty and clean the tank.

  2. Repair cracks and joints with epoxy mortar.

  3. Apply two coats of RC-7 Seal internally, ensuring full coverage.

  4. Cure for 7 days before refilling.

Result:
Completely watertight tank suitable for potable water storage, with no leaching or contamination.

D. Bathroom and Terrace Waterproofing

  • Apply the coating on the floor and up to 300 mm height on the wall to prevent lateral leakage.

  • Use RC-7 Seal below tile beds or cement screeds.

  • Protect from mechanical damage until tiling is completed.

5. On-Site Environmental and Technical Considerations

Condition Recommended Action
High Temperature (>40°C) Dampen surface; apply during cooler hours.
Low Temperature (<5°C) Avoid application; polymer may not coalesce.
High Wind Protect surface from dust and rapid drying.
Rain Forecast Postpone application; ensure dry conditions for 24 hours.

6. Quality Control and Testing

To ensure performance, site tests should be performed:

  • Adhesion Test:
    After 7 days curing, pull-off strength should exceed 1.5 N/mm².

  • Water Tightness Test:
    Ponding water for 72 hours should show no leakage.

  • Film Thickness Measurement:
    Minimum dry film thickness = 1.0 mm after 2 coats.

These simple tests confirm correct application quality.

7. Troubleshooting Guide

Problem Possible Cause Remedy
Peeling of coating Improper surface cleaning Ensure substrate is clean, SSD before coating
Cracks in coating Applied too thick or under direct sunlight Apply recommended thickness in shade
Powdery surface Improper curing Mist cure and avoid drying wind
Blistering Moisture trapped under film Apply on SSD surface, not wet
Uneven color Mixing inconsistency Mix thoroughly with mechanical stirrer

8. Compatibility and Integration with Other Robust Products

RC-7 Seal is designed to integrate with the Robust Waterproofing System Line:

  • RC Plug – Instant leak-stopping compound for active leaks before applying RC-7 Seal.

  • RC Leak Fix Admixture – For internal integral waterproofing of concrete before coating.

  • RC Roof Shield – UV-resistant top coat over RC-7 Seal for exposed roofs.

  • Robust Repair Mortar – Patch repair for honeycombs, cracks, and joints.

When used in combination, these systems provide 360° waterproofing protection.

9. Chemical Resistance and Durability

RC-7 Seal resists:

  • Mild acids (pH > 5)

  • Chloride and sulfate attack

  • Alkaline washouts

  • Carbonation penetration

The polymer’s hydrophobic chains act as barriers to ion migration, reducing corrosion of steel reinforcement and extending concrete life.

Accelerated aging tests show over 10 years of durability with negligible loss in adhesion or flexibility under cyclic wet–dry exposure.

10. Mechanical Properties Explained

Parameter Performance Explanation
Adhesion Strength ≥1.5 N/mm² Ensures bond with substrate
Flexibility >20% elongation Accommodates minor structural movement
Water Absorption <1% Prevents moisture ingress
Crack Bridging 0.4 mm Seals hairline cracks effectively
Abrasion Resistance Excellent Suitable for walkable surfaces

11. Maintenance Guidelines

  • Periodically inspect exposed coatings every 2–3 years.

  • For minor damage, clean the area and recoat with a fresh layer of RC-7 Seal.

  • Avoid mechanical impact or abrasion during service life.

  • If used on rooftops, reapply a reflective coating every 5 years for best UV resistance.

12. Environmental Health & Safety Compliance

RC-7 Seal complies with REACH, ASTM, and ISO 14001 environmental standards.

  • VOC Content: <50 g/L (eco-safe)

  • Toxicity: Non-toxic and suitable for potable water applications.

  • Disposal: Dispose of empty containers as per local waste management rules.

Robust Construction Chemicals promotes eco-sustainable products that minimize emissions and enhance building durability.

13. Packaging Information

Component Packaging Type Weight
Liquid Polymer (A) HDPE Can 10 kg / 20 kg
Cementitious Powder (B) Laminated Bag 25 kg / 40 kg
Standard Set 30 kg (10 + 25)

Each set covers approximately 15–20 m² in two coats, depending on surface type.

14. Shelf Life & Storage

  • Shelf Life: 12 months from manufacturing date.

  • Store between 5°C – 35°C in a dry, shaded area.

  • Protect from frost and direct heat.

  • Always reseal partially used containers tightly.

15. Technical Advantages Recap

  • Two-component high bonding waterproof system

  • Brushable, easy-to-mix, and fast-setting formulation

  • Flexible, durable, and weather-resistant

  • Suitable for internal and external use

  • Compatible with cementitious and masonry substrates

  • Chloride-free and safe for reinforced concrete

  • Reduces carbonation and chloride ingress

  • Increases life of structures by reducing corrosion potential

16. Safety Data Summary

Hazard Class Description
Chemical Nature Non-hazardous
Flammability Non-flammable
Handling Use PPE (gloves, goggles)
First Aid Wash with water on contact
Environmental Impact Biodegradable, low VOC

17. Field Performance Verification

Laboratory testing and field trials conducted by Robust Construction Chemicals R&D Division demonstrate that RC-7 Seal maintains structural integrity even under:

  • Continuous water immersion

  • Freeze–thaw cycles

  • Chemical exposure (chloride, sulfate environment)

  • High humidity and temperature variations

After 1000-hour accelerated weathering, RC-7 Seal retained 95% of its original adhesion and 100% waterproofing efficiency.

18. Final Application Checklist

✅ Before Application ✅ During Application ✅ After Application
Surface cleaned and repaired Mix ratio A:B = 1:2.5 Allow 24 hrs drying
Substrate SSD condition Apply 2 coats crosswise Cure for 7 days
Cracks sealed Maintain even thickness Protect from sun & rain
Tools ready Avoid standing water Test waterproofing

19. Product Summary

Product Name: RC-7 Seal Cementitious Coating
Type: Two-component polymer-modified cementitious waterproofing compound
Brand: Robust Construction Chemicals
Form: Brushable slurry
Application: Roofs, tanks, basements, retaining walls, bathrooms
Performance: Long-lasting, flexible, non-toxic, weatherproof

20. Final Technical Note

RC-7 Seal Cementitious Coating is not just a waterproof layer — it is a structural defense system. By chemically integrating with the concrete substrate, it ensures both waterproofing and durability enhancement.
Engineers and applicators trust RC-7 Seal for its ease of use, proven field performance, and cost-effective long-term protection.

When applied as per the above instructions, RC-7 Seal guarantees a permanent waterproofing shield that safeguards concrete for decades.