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Discoloration never even occurred to me. I don't think it's discoloring in the Cutlass yet. Yeah, I strongly suspect heat also plays a big part. It's been garaged over 24-years, thought it did spend ~10 hours a day during the Spring/Summer/Fall out in full sun for 19 of those years. It was 100% outdoors for 8+ years before that. I don't know if that's enough cumulative UV to cause this kind of vinyl decomposition. My garage does get really hot in the summer though. About 10-degrees over ambient, 15-20 if I've driven any of the cars, as the hot engine makes the garage even hotter. I've seen rubber belts in VCRs and cassette decks literally turn to black goo when stored in a hot garage, and that kind of equipment almost never sees sunlight. Seriously thinking maybe I need to install a mini split in my garage.