Two hybrids in 13 years purchased new and didn't do this on either one. Never an issue, no leaks.
Seasoning was more of a thing with real canvas (not vinyl covered), things like canvas tents, older pop-ups without the vinyl covering. And it was for more than seams, it was for the canvas as well.
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Chuck
2013 Jayco Jayfeather X20 E (sold)
2016 Chevy Silverado LTZ 2 Z71 Crew Cab (sold, and dearly missed)
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