Polyurethane & Hybrid Waterproofing Systems

Flexible, seamless protection for concealed and below-ground waterproofing.

Kesari Conchem polyurethane and hybrid waterproofing systems are designed for concealed, wet-area and below-ground applications where flexibility, continuity and moisture protection are critical. The range includes water-based polyurethane hybrid coatings and bitumen-modified liquid-applied membranes for bathrooms, balconies, plinths, basements, foundations and underground structures. System selection should consider substrate condition, exposure, movement, water contact and the protective finish above the coating.

Category Overview

What It Does

Polyurethane and hybrid waterproofing systems form continuous liquid-applied coatings that cure into flexible waterproof barriers. Depending on the formulation, they can resist liquid ingress, bridge cracks, accommodate movement, act as vapour barriers and protect concrete or masonry from moisture and aggressive exposure.

Where It Is Used

The supplied documents support applications across bathrooms, shower rooms, terraces, balconies, plinth-level damp proofing, foundations, basements, retaining walls, wet areas, underground structures, concrete and brick foundations, columns and beams.

Why It Matters

Concealed and below-ground areas are difficult to repair after finishes or backfilling are complete. A correctly selected PU or hybrid waterproofing system provides a seamless protective layer that can accommodate movement and reduce moisture ingress before screeds, tiles, soil or other protective build-ups cover the treated surface.

Selection Considerations

Application type: concealed wet area, plinth damp proofing, foundation, basement or underground structure.
Substrate: concrete, brick, plaster, metal, timber or other documented compatible surfaces.
Expected structural movement and crack-bridging requirement.
Whether the system must function as a vapour barrier.
Continuous-water exposure limitations stated in the relevant TDS.
Substrate moisture condition and surface preparation requirement.
Protective screed, plaster, tile adhesive or other covering after waterproofing.

Products

1. Kesari Flexi PU 250

Product Name			Kesari Flexi PU 250
Product Type / Technology			One-Part Water-Based Polyurethane Hybrid Waterproofing Coating
Product Overview			A ready-to-use, water-based polyurethane hybrid liquid-applied coating for concealed waterproofing. It forms a seamless flexible barrier with good crack-bridging and substrate adhesion, making it suitable for wet rooms, terraces, balconies and plinth-level damp proofing.
Key Benefits			• Seamless, 1-part ready-to-use application • Good crack-bridging with high flexibility and elongation • Bonds to multiple substrates and absorbs vibration • Fast-drying, liquid-impermeable and suitable for brush or roller
Best Suited For			Bathrooms, shower rooms, balconies, terraces and plinth-level damp proofing that will be protected by screed, plaster, tile adhesive or finishes.
Primary Applications			• Bathrooms & shower rooms • Terraces & balconies • Wet rooms • Plinth-level DPC / damp proofing • Concealed waterproofing
Pack Size			5 kg and 20 kg containers
Technical Highlight			Water-based PU hybrid \| ~250% tensile strain at break

Download TDS

2. Kesari White Armor PU

Product Name			Kesari White Armor PU
Product Type / Technology			Bitumen-Modified Single-Component Liquid Waterproofing Coating
Product Overview			A cold-applied, bitumen-modified single-component waterproofing coating positioned for foundations, basements and retaining walls. The brochure describes it as a seamless joint-free membrane and vapour barrier that protects substructures against moisture, chloride and sulphate exposure.
Key Benefits			• Cold-applied with no heating required • Forms a seamless, joint-free waterproof membrane • Acts as a vapour barrier against moisture penetration • Flexible coating for foundation and substructure protection
Best Suited For			Foundations, basements and retaining walls requiring concealed bitumen-modified waterproof protection.
Primary Applications			• Foundations • Basements • Retaining walls • Substructures
Pack Size			5 kg and 20 kg
Technical Highlight			Bitumen-modified single-component system

Download TDS

3. Kesari Black Armor PU

Product Name			Kesari Black Armor PU
Product Type / Technology			Bitumen-Modified Single-Component Liquid Waterproofing Coating
Product Overview			A protective bitumen-modified liquid-applied coating that dries to form an elastic, flexible and impermeable waterproof membrane. It is intended for concrete, brick foundations, retaining walls and other structures requiring cold-applied moisture, vapour and chemical protection.
Key Benefits			• Cold-applied with no preheating required • Creates a seamless, flexible and impermeable membrane • Acts as a vapour barrier and resists chloride and sulphate exposure • Documented crack-bridging performance greater than 3 mm
Best Suited For			Basements, foundations, retaining walls and underground structures requiring flexible bitumen-modified waterproofing and vapour protection.
Primary Applications			• Basements • Brick & concrete foundations • Retaining walls • Underground structures • Concrete columns & beams
Pack Size			5, 20 & 30 kg
Technical Highlight			>700% elongation \| >3 mm crack bridging

Download TDS

Specify the Right Concealed Waterproofing System Before It Is Covered

Confirm the substrate, exposure, movement and protective build-up before choosing between PU hybrid and bitumen-modified waterproofing. Review the approved TDS and application requirements before execution.

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