We now have A large variety of coloured Topcoats /Flow Coats available in our store Topfast has excellent physical properties, water resistance and UV light stability. It cures tack free, unlike standard gelcoat, which allows it to be used like a paint to seal and fibreglass surfaces. Topfast is suitable for a wide range of coating applications and for all GRP surfaces where a hard wearing waterproof coating is required. Not suitable for spray application. Supplied with free catalyst.