I have a 49 Chev Fleetline car and I am in the process of reassembly. I have looked just about everywhere for the front fender to inner fender gasket. The only source I could find said that they were on back order for about 6 months. I got to thinking, and I am wondering if 3M fast & firm sealer would be a suitable replacement? Anyone know about this or have ideas about this one. I also have some butyl rubber in a tube?