Quality vinyl won't crack like that and its integrity will be pretty much impervious to such chemicals. The stitching can be vulnerable to UV and chemicals, but MasterCraft's cracking vinyl problem is due to just plain old inferior vinyl.
Fortunately (for them), the problem manifests itself after the warranty is up, so they're off the hook. Between that screwed up upholstery and my creaky dash, not much going on on my boat to impress the passengers with MasterCraft quality.
'04 MariStar 230VRS/MCX