FiberFix is a fiberglass patch with a resin already impregnated inside of the patch. For use on flat surfaces. Watertight – can be used indoors or outdoors on boats, automobiles, gutters, fences, wheelbarrows, bathtubs, plumbing, etc. Cures in only 10 minutes in natural and UV (ultraviolet) light. Patches start gold and cure white. Can be sanded and painted.