Higher molecular bodyweight diglycidyl ethers (n ≥ 1) are shaped from the response in the bisphenol A diglycidyl ether shaped with further bisphenol A, this known as prepolymerization: Normal gelcoat formulated for use with polyester resins and vinylester resins doesn't adhere to epoxy surfaces, nevertheless epoxy adheres pretty very well https://www.propanraya.com/id/produk/epoxy-fast-dry