What is Waterproofing Coatings?
Waterproofing coatings are protective coating systems designed to block water penetration and resist moisture damage on substrates such as concrete, cement mortars, masonry, and various building surfaces. Typical applications include bathrooms, kitchens, balconies, roofs, basements, foundations, water tanks, and wet rooms.
In these systems, performance additives are used to improve film integrity, flexibility, adhesion, crack-bridging ability, water resistance, and construction workability, while keeping the coating stable during production and application.
Common Challenges in Waterproofing Coatings Production
Manufacturers often need to address:
- Insufficient water resistance or water absorption reduction
- Cracking / poor flexibility and weak crack-bridging in temperature changes
- Poor adhesion on challenging substrates or after water immersion
- Sagging on vertical surfaces and weak thickness build
- Foam & micro-foam defects (pinholes, craters) that reduce waterproof performance
- Poor workability (draggy application, short open time, poor leveling)
- Stability issues (settling, viscosity drift, compatibility problems in polymer-cement systems)
High-Performance Additives for Waterproofing Coatings
BOTAI offers a selected portfolio of additives commonly used in waterproofing coating formulations to help improve waterproof performance, durability, and application reliability.
VINNATE® Redispersible Polymer Powder (RDP)
Function:
Enhances polymer-cement waterproofing systems by improving adhesion, flexibility, and water resistance, helping coatings perform better under wet conditions and substrate movement.
Core Advantages:
Helps build a stronger polymer network in cementitious systems; supports crack resistance and durability; improves bonding strength and overall waterproof performance for stable jobsite results.
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BOTAI Polymer Emulsions / Latex (SBR Emusion)
Function:
Provides binder support for waterproofing coatings, helping improve film formation, flexibility, adhesion, and water resistance for different waterproofing coating designs.
Core Advantages:
Enables flexible selection for different performance targets (crack-bridging, adhesion, durability); supports stable processing and consistent film properties; suitable for both waterproof coating and polymer-cement waterproof systems depending on grade.
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SILRERIOS® Water Repellents (Silane-based Powder)
Function:
Improves hydrophobicity and reduces water absorption in cement-based waterproofing systems, supporting long-term water repellency.
Core Advantages:
Enhances water-beading effect and reduces capillary absorption; supports durable hydrophobic performance while maintaining compatibility with cementitious fillers; helps coatings resist water penetration.
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VAMCELL® Cellulose Ethers (HPMC / HEMC)
Function:
Improves workability and stability in waterproofing coatings by providing thickening, water retention, anti-sag control, and better open time, especially in cementitious or polymer-cement systems.
Core Advantages:
Helps achieve smoother application and stable build on vertical surfaces; supports reduced bleeding and better consistency; improves jobsite reliability through stable rheology control.
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BOVICO® Defoamer
Function:
Controls foam and micro-foam during mixing and application, reducing pinholes and surface defects that can compromise waterproof performance.
Core Advantages:
Fast defoaming and long-lasting foam control; supports denser film formation and better surface integrity; improves batch consistency and coating quality.
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With suitable grade selection and formulation trials, these additives can help you achieve:
Better waterproof performance: reduced water absorption and improved water resistance
Improved durability: better crack resistance, flexibility, and long-term stability
Stronger adhesion: improved bonding strength on cementitious substrates and under wet exposure
Cleaner film integrity: fewer pinholes/craters and improved barrier performance
Better workability: smoother application, improved anti-sag, and more consistent thickness build
Note: Actual results depend on binder chemistry, cement/filler system, PVC, dosage, and processing conditions. Lab and pilot trials are recommended.
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To support your evaluation, BOTAI can provide:
Free samples for lab screening and pilot trials
TDS / SDS and technical guidance
Grade recommendation based on your system type (polymer-cement waterproof coating, acrylic waterproof coating, JS-type systems, etc.)
Packaging, lead time, and supply coordination info
FAQ
It depends on your formula type. Cementitious waterproof coatings commonly use RDP to enhance flexibility/adhesion, while liquid-applied systems rely on latex binders for film formation and crack-bridging. In some systems, they can also be used together depending on design targets.
Foam control is critical. Defoamer selection should match your surfactant/dispersant system and mixing shear. We typically recommend screening a small set to optimize micro-foam control without causing craters.
Cellulose ether selection (HPMC/HEMC) is key for water retention, viscosity build, and anti-sag. Share your target open time, density, and application method to choose the right grade.
Dosage is formulation-dependent. We can propose a starting trial range and optimize based on adhesion, water resistance, crack resistance, and application tests.