Paint and body question

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san diego
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1973 mustang convertible(some day)
I'm including a pic of a seam that I see the paint crack in a lot in finished paint jobs and don't know what steps I can take to prevent it. Just stick regular seam seal in it. Is the 2k a better option? Somebody suggested to trying to V it out some.

seam.jpg

 

piper62j

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My Car
1973 Q-Code Mach 1. Full restoration in progress.
The paint on this joint sometimes cracks due to the expansion and contraction of the spot welded joint. The roof is spot welded to the quarter panels and A pillars but is sealed with lead at the factory..

IMHO, you could weld the joint and cut a fake seam, but if you are off just slightly with the grinder, could cut into the thin sheet metal, missing the weld and cause yourself more work. I would lead it in and just scrape a seam over the joint with a file which would not cut into the sheet metal.. It's what I do..

 
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