Epoxy Barrier-Kote is a multi-purpose two-part epoxy primer for use above the waterline. Epoxy Barrier-Kote is an excellent undercoater for Interthane Plus. It is used as a sanding surfacer to smooth rough lay-up and to resurface cracked and crazed gelcoat. Epoxy Barrier-Kote should also be used over clear epoxies to eliminate the effects of amine blush.