Interlux Watertite is a 2-part; easy to use epoxy compound for filling holes and repairing scratches in gelcoat and fiberglass above and below the waterline. It has a long easy-to-sand window and can be applied to a thickness of 3/4" without sagging. Its superior spread ability makes it an ideal glazing compound for filling small nicks and scratches. Can be used above or below the waterline.