Bostik WATERSTOP Flexible Waterproof Coating

Bostik WATERSTOP Flexible Waterproof Coating Long-lasting waterproof protection for flat roofs, gutters and more Bostik WATERSTOP Flexible Waterproof Coating is a high-performance, flexible waterproof coating designed to seal and protect surfaces against water and moisture. Ideal for quick leak repairs and long-term weatherproofing, it provides an instant waterproof barrier on both wet and dry surfaces. Key Features Instantly waterproof, even if it rains after application Suitable for wet or dry surfaces Flexible finish resists cracking UV, frost and temperature resistant Solvent-, bitumen- and isocyanate-free No primer required on many common substrates Suitable for vertical and horizontal surfaces Ideal For Perfect for: Flat roofs Gutters Flashing Around roof lights Chimney stacks Concrete foundations Walls It helps stop water passing through porous, cracked or degraded surfaces, making it a reliable solution for repair and protection jobs around the home or site. Suitable Surfaces Can be applied without primer to many substrates, including: Concrete Stone Wood Metal Zinc Clay Tiles Slate Felt Polystyrene Most plastics Not suitable for polyethylene, polypropylene or bitumen coatings. Technical Information Colour: Grey Form: Liquid Composition: MS Polymer Application temperature: +5°C to +35°C Service temperature: -25°C to +80°C Specific gravity: Approx. 1.5 Drying time: Immediately waterproof Full cure: Minimum 24 hours Second coat: After approx. 4 hours at +20°C 6kg bucket: (1 x foil bag) 14kg bucket: (2 x 7kg foil bags) Coverage Approx. 2.3kg to 3.1kg per m² when applied in two coats at 1.5mm each, to achieve a minimum 3mm dried film thickness. Coverage may vary depending on the substrate, application method and required performance. How to Apply Ensure the surface is clean, sound and free from dust, grease, loose material, rust and standing water. Apply two coats at a minimum thickness of 1.5mm per coat using disposable brushes or short pile rollers. For cracks over 5mm on roofs, fill fully and reinforce with a suitable flexible scrim. In corners or movement-prone areas, bed reinforcing scrim into the first coat before applying the second. Important Notes Can be applied to damp surfaces once excess water has been removed New cement-based surfaces, mortar and brickwork must cure for at least 2 months Not suitable for regular foot traffic Not suitable for ponds, fish tanks, drinking water tanks or areas of continuous water immersion Do not apply over roof lights, glass or windows Storage Store upright in original unopened packaging in cool, dry conditions between +5°C and +25°C. Protect from frost and direct sunlight. Shelf life is up to 12 months from date of manufacture.