Interlux Watertight Epoxy Filler 500ml #94YAV135500A twopart, easy to use, fast drying epoxy compound for filling holes and repairing scratches in gelcoat and fiberglass. Interprotect Watertite YAV135 is especially recommended for use to fill gelcoat blisters below the waterline. It is recommended for use with the Interprotect Epoxy Barrier System or VC Tar2. Interprotect Watertite YAV135 is an excellent fairing compound due to its unique twophase cure, which gives a long easytosand window. Interprotect Watertite YAV135 can be applied to a thickness of 3/4" without sagging and its superior spreadability makes it an ideal glazing compound for filling small nicks and scratches. Note: Epiglass Epoxy Resin can also be used as a fairing compound when mixed with HT440 Filler powder.