Two portion epoxy which is UL tested as per Typical 746A, formulated to improve arc resistance. Bonds nicely to selection of substrates. Ordinary gelcoat formulated for use with polyester resins and vinylester resins will not adhere to epoxy surfaces, though epoxy adheres incredibly well if placed on polyester resin surfaces. https://www.propanraya.com/id/produk/epoxy-fast-dry