It's done both ways nowadays. Bondo on metal or bondo on primer. I understand the reasoning behind both camps. B&M figures adhesion. B&P figures corrosion resisitance. If I have an doubts on a solid backsurface and fear water contacting I always use waterproof stuff. For instance my welded firewall will get a skim of Duraglas or similar. As will most of my repairs on the vert. The American got this treatment and near as I can tell It's at the 10 yr point soon! Not a bubble or sign of returning corrosion. Sure it has not gotten driven much, but it has spent one winter outside under a cover and lots of time in underground garages. I run a dehumidifier in there now, but not for the first year or so. I also find that us "old guys" tend to go to the bondo on metal. The younger guys go the opposite route. -- Mark Price Morgantown, WV 1969 AMC Rambler, 4.0L, EFI, T-5 2004 Grand Cherokee Laredo, 4.7L, Quadratrc II " Chronic Pain Hurts" -------------- Original message ---------------------- From: Don <don_nsx@xxxxxxxxxxxx> > Davis, > I've talked to a lot of "experts" and they all say that the "bondo" goes on the > metal and the primer goes over that. > Whatever you use, Bondo or some other filler, needs to cling to the metal, NOT > the primer. > FWIW. > Don > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: > http://splatter.wps.com/pipermail/amc-list/attachments/20080712/787fc05e/attachm > ent.htm > _______________________________________________ > Amc-list mailing list > Amc-list@xxxxxxxxxxxx > http://splatter.wps.com/cgi-bin/mailman/listinfo/amc-list _______________________________________________ Amc-list mailing list Amc-list@xxxxxxxxxxxx http://splatter.wps.com/cgi-bin/mailman/listinfo/amc-list