RT640A Refrigeration Technologies Defender Coil Coating (15 oz Can) - Defender Coil Coating is a solvent borne thin film epoxy resin that will bond to all metals. The product will air dry under normal conditions to complete hardness in less than 30 minutes. A one time application is all that is necessary to protect coils fins and other metals from corrosive environments. Defender is supplied as a Clear Coating to comply with current Federal and State EPA/VOC requirements.