I work part time at a body shop. We do alot of frame up resto's. All I can say is we let it set for about a week before we start working the panel. We let cars set about 2 weeks before we color sand and buff a car. I have never seen a problem with any of them as of yet. My truck was painted this way over 3 years ago and have had no issues with it. Just my two cents 30 days is way to long.
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