Never heard of this, just looked into it, I'm surprised it's just $20 more per roll than their economy cast 3270. That said, I guess it's not as conformable as their 3220 line, it's a couple hundred more a roll. May want to consider both for testing.
SLX is really great stuff, I've been using it for years, the initial tack is very low though, and post heating is necessary if you like to sleep at night.
Oh now that's interesting... sounds like the issue would be more the base media than the laminate?
I was reading through the product bulletin, and it linked me to the 'sheeting, scoring and film cutting bulletin, which shows techniques for cutting rolls and stacks of materials with saws. Not relevant, but interesting as hell. I'd never seen anyone officially saying 'you can cut a roll with a saw', but here we are.
Last thing, I see 280 is recommended to post heat to 200F after application. I could have sworn 3m ij180 did not require post heating (just checked, it does), or at least folks would complain about having to do it with SLX. I'd postulate this is due to the air channels, and the need to seal them to prevent water intrusion. This would make both stand alone cut letters most susceptible, and make the full wraps less vulnerable, assuming that wrapping and adhering over the prior layer provides a more conformable bond than sticking to paint, as both the bottom and top layer will conform to one another.
Any way, are you post heating to 200F?