Bostik Flexacryl Instant Repair - Black - 5kg

This product is specifically engineered for flat roof applications and is not recommended for pitched or vertical surfaces.

Remove any loose debris, dirt, or contaminants. While the product adheres to wet surfaces, a cleaner surface will ensure better long-term adhesion.

Curing times vary depending on temperature, humidity, and application thickness. It forms an initial waterproof layer quickly, but full cure can take several hours to a few days. Avoid heavy foot traffic or extreme weather for at least 24-48 hours.

Once fully cured, it may be possible to paint over the surface, but compatibility should be tested with your chosen paint. It is generally designed as a final protective layer.

When stored correctly in a sealed tin in a cool, dry place, the product typically has a shelf life of 12 months from the date of manufacture. Check the packaging for specific details.

Yes, its compatibility with various substrates like metal and cement, combined with brush application, makes it suitable for sealing around roof penetrations such as chimneys and vents.

Coverage varies based on the surface porosity and the thickness of application. For a single coat, expect coverage of approximately 3-5 square meters, but always refer to product data sheets for precise figures.

Ensure the product has been stirred thoroughly. If the ambient temperature is very cold, allow the tin to warm up to room temperature before stirring and applying.

Ensure the surface is free from excessive dust, oil, or loose material. While it applies to wet surfaces, very heavy contamination can impede adhesion. Reapply, ensuring the surface is clean before application.

This can occur in very humid or cold conditions. Allow additional time for curing. Ensure application is not excessively thick in a single coat, as this can prolong drying times.

Ensure the repaired area has adequate drainage and is not a low point where water can accumulate. The product is waterproof but does not inherently fix drainage issues.