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There's a tar like substance sealing all the welds in the interior of my 68 impala. Should I wait till I por-15 the interior before I reseal the welds (it all flaked off) or should I reseal them first? Also, what shold I seal it with? Silicone?
 

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That substance is called "seam sealer" and no you should NOT seal them before the por 15. Exstensivly clean all that goop off and aplly the por-15 over the seam as well as the rest of the floor, it will seal it. Use two layers over the seam to be sure.

HK
 

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I used a product from 3M called heavy duty drip chek sealer #08531.Worked good and dried fairly fast in cold temps,better than silicone.
 
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