Please note always apply x2 coats of Alpha Grip to ensure a strong bond at a maximum of 6 to 8 hours apart. Alpha Grip cannot be used on sealed, stained, varnished, oiled, or painted surfaces. All previous coatings must be removed before application. Alpha Grip non-slip floor paint can be used on highly porous unsealed surfaces including raw wood, concrete, brick, sandstone, tarmac/asphalt, quarry, and most other unsealed natural stone. Alpha Grip is not suitable for sealed tiles, vinyl, laminate, linoleum, or metal. If you require a product for these surfaces, please use Dura Grip E2 anti-slip epoxy paint. Only use Alpha Grip as its own primer as it may not adhere to third-party primers.