To do it "right" the panels should be welded in. What you are thinking of is automotive seam sealer. It is used to seal over welds or where panels overlap to keep moisture out. Once your panel is welded in, I like to prime over the welds and bare metal with a rust inhibiting primer, then seam seal it, then top coat. VW bodies were welded together and seam sealed over the bare metal. The metal ends up rusting under the seam sealer as some moister always gets through and then the seam sealer holds it there. Many VWs I have done rust repair and restoration work on have more rust around the seam sealed areas. Priming first well alow everything to be coated and all bare metal to be covered and should give the longest lasting repair. I have been doing it that way on all the cars we restore at the shop and everything that has come back is staying rust free. Here in the midwest, thats saying something! Sutff rusts out here just from the humidity!
Jason
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