PeachParts Mercedes-Benz Forum - View Single Post - Rust-proofing lap weld?

F18 · #8 10-25-2007, 07:22 PM

bgkast......some have mentioned the welding primer.....I have used it on some of my early restorations....its ok but you have to understand that anything on the metal including the welding primer burns off and the fumes and contaminents do effect the quality and strength of the weld.
Now if I use it I clean it or grind it off the exact area being spot welded or bead welded and then hit it with a good quality high zinc primer afterward.
To keep water from entering the seams use a 3M Seam Sealer (gray color) in caulk tube or in can and brush it on or use a putty knife.(I bought the last batch from a CarQuest) .....thats exactly how most of the factory seams are done. The stuff can be painted and or rust proofed when it dries.