Interlux InterProtect Watertite Epoxy Filler is a two-part, easy touse, fast drying epoxy compound for filling holes and repairingscratches in gelcoat and fiberglass. Interprotect Watertite YAV135 isstrongly recommended for filling gelcoat blisters below the waterline.It is recommended for use with the Interprotect Epoxy Barrier System orVC Tar2.