I firmly believe that getting welds without porosity is very important to preventing rust from forming from the backside and bubbling under the paint. It's one aspect of automotive sheetmetal replacement that never seems to get discussed.
After welding and grinding I like to blow air from the backside and look for it is coming through the welds. Rubbing some filler dust on the welds can help you spot the pin holes.
On parts with good access to the backside I primer and apply seam sealer as added insurance.
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If it breaks. I didn't want it in the first place.
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69 GTO \ 72 FIREBIRD \ 1/2 OF A 64 GTO \ 70 JAVELIN \ 52 FORD PU \ 51 GMC PU \ 29 FORD PU \ 85 ALFA ROMEO SPYDER \ A HANDFUL OF ODD DUCATI'S \ 88 S10 LT1 BLAZER & MY DAILY DRIVER 67 SUBURBAN.
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