Synthesis of bisphenol A diglycidyl ether The most common epoxy resins are based on reacting epichlorohydrin (ECH) with bisphenol A,  leading to a special chemical material referred to as bisphenol A diglycidyl ether (commonly generally known as BADGE or DGEBA). Primer Coat: A thin epoxy primer is rolled on (In case the technique calls for it