Koster NB Elastic Grey - 2 Component, Elastic Mineral Waterproofing - W 233 033

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KOSTER NB Elastic Grey is a light-colored, waterproof, elastic, wear-resistant coating with excellent adhesion to all cementitious and masonry substrates. The material can bridge cracks up to a width of 40 mils, is abrasion resistant and resistant to concrete corroding water such as dilute acids and alkalis. It possesses a good UV-resistance and is radon-proof.

Key features

• For mineral substrates such as concrete and brick walls
• Resistant to foot traffic
• Ideal for balconies and terraces
• Suitable for moist surfaces
• Easy application
• Fast and safe
• No overlaps and completely seamless
• Suitable for waterproofing under tiles
• UV resistant
• Open to vapor diffusion
• Together with KÖSTER NB 1 Grey suitable for negative side waterproofing
• Cementitious system
• Ideal in combination with KÖSTER NB 1 Grey where crack bridiging is required, for example on wall-floor junctions, corners, etc

Coverage: Approx. 75 - 100 sq ft/unit.

Fields of Application KOSTER NB Elastic Grey coatings are wear-proof, elastic, and waterproof, and can be used for areas subject to mechanical stresses and areas that are subject to cracking such as waterproofing layers on terraces and balconies, as protection for concrete surfaces subject to foot traffic, waterproofing for water tanks, swimming pools, and wet rooms. If a waterproofing system of 2 layers of KOSTER NB Elastic Grey is applied, the material may also be used (applied as a third layer) as tile adhesive. It is not suitable for waterproofing against negative side water pressure or for waterproofing roofs.

Substrate Substrates to receive KOSTER NB Elastic Grey must be sound, solid, and clean. Prime absorbent substrates with Koster Polysil TG 500. Dampen non-absorbent substrates. Avoid standing water on the area to be sealed.  


KOSTER American Corporation is a subsidiary of KOSTER Bauchemie AG of Germany.

Founded in 1982 KÖSTER BAUCHEMIE AG specializes in the development and production of high-quality waterproofing products and systems. Today, KÖSTER forms a group of more than 20 companies with worldwide activities in more than 50 countries. Its headquarters are located in Aurich, Germany.

Our R&D facility, production and technical department are all located on the same campus in Virginia Beach, VA. This allows each department to work closely together to ensure each product conforms to the highest standards of quality. 

KOSTER operates two production facilities in Virginia Beach. The liquid facility produces all of our epoxy coatings while the powder facility produces our self-leveling underlayments as well as other cementitious waterproofing products. 

We place tremendous value on producing our products ourselves in order to ensure the highest level of quality control from development to application. We strongly believe in providing our customers with an excellent and safe experience with our products.