We checked. The Gel Coat from Jamestown Distributors is not made for use inside a mold. Their Gel Coat is meant for coating the outside surface of boat hulls, and is meant to air dry, leaving a coating of wax on the surface. So it appears to be unsuitable for use as a Gel Coat inside a mold as a base for laminating fiberglass cloth, etc. Has anyone tried the product that can tell me otherwise?