The drying and cracking on your vinyl is not really from the air drying it out. Well...it may be a bit. What it is from is the cleaning chemicals and sunlight eating away at the vinyl. I live in a horribly humid environment (80% humidity is the least we see, usually 90-95%) and we had a pontoon boat that the seats cracked and completely fell apart. This was due to me not knowing any better and using 409 to clean and armor-all to protect. NEVER do that. As per my 2004 Supra vinyl care guide, use ONLY Fantastik to clean and Formula 303 to protect. So now, after each use I wipe the seats with Fantastik and apply a generous coating of 303 and rub it in. Do not use any kind of petroleum based product to clean or moisturize. 303 may be expensive, but it is not as expensive as reupholstering the boat. Later Tiffany
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