My car is an Eliminator. I am working on the molded plastic, interior rear quarter trim panels. The molded plastic backing has a couple of large cracks. Does anyone know what kind of plastic was used by the manufacturer, and what is the best means of repair? I tried fiberlass cloth and resin, but it did not bond to the plastic. I noted some plastic glues/epoxies state not for use with PE or PP plastics. I could really use some help. Thanks.