You could paint over seam sealer or dig it out. I dug out and wire wheeled all seam sealer in the trunk and filled with a liberal couple coats of por 15. Seam sealer was a fast and dirty way for the factory to seal the joint. A lot of times they smeared too much on. After 50 years it gets hard and shrinks and let's moistior and rust under it. I got a cheap wood chisel set and it takes it out real quick by hand, then wire wheel, por 15 and it will seal it up permanently. Unless you are doing a show car.
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