I'm replacing the rusty floorboards in my '54 Customline and I'm interested in knowing what everyone uses for seam sealer. I want to cover the weld seams top and bottom. I read in another post that some guys are using Liquid Nails! Any suggestions?
Go to a body shop supplier and get the stuff designed for the job. Wurth , 3M Etc , some of them are very reasonably priced.
https://www.jalopyjournal.com/forum/threads/liquid-nails-as-seam-sealer.969791/ https://www.jalopyjournal.com/forum/threads/alternative-for-expensive-seam-sealer.1174497/
A different approach...........I didn't use a seam sealer as such on the floorboards. As I went along and finished areas with the patch panels, I applied por-15 Por Patch to the seams, and then a coat of Por-15 on the entire panel/area. Caution there........por-15 requires a tooth on the metal surfaces for proper adhesion. Sandblasting is the best way to achieve that. If you try to apply it so the factory surface/finish of the sheetmetal, it'll peel off. When doing outside seams that will get finish paint, primarily the raingutters/roof driprails, I'd strongly recommend 3M panel bond. So much easier to get a nice finish/contour, and has the added advantages of being easily sandable when set up. Not unlike body filler for finish sanding and blending. It also has a rust inhibitor. This was highly recommended to me by the local 3M rep, and I'm so glad I took his advise. The tough part to swallow there was the $70ish for the special caulking gun. The question I always had was when to apply the seam sealer if I was going that route.....before of after epoxy primer. That was one reason I decided to do the por-15 route, besides, my entire car was por-15'd on inner surfaces and underside.