The white adhesive stipulation comes from a rigid and OCD supervisor who insists that all window graphics have to be white on the back. Over the years, Avery has fiddled with the liner paper on supercast and it is unworkable. The stuff buckles within 60 seconds of coming off the roll - and it's not like the shop isn't temp controlled.White adhesive instead of grey, that's not going to have much in the way of air egress as far as I know. Does it need to be 100% opaque?
Arlon's 6500 trans white has a white adhesive and it's cast, and their calendared alternative is 4100, though I've never used that stuff, but the 4500G clear I use prints great on my 560, so assuming it would have similar performance. I can vouch for laminating with arlon's 3220, 3170, and 3420 laminates, they're all fine, 3420 is calendared and likes to shrink over time, 3170 is cast, but not intended to conform to complex shapes.
We use IJ40 and IJ180 for 90% of our stuff, but someone here has a rule that window graphics must be white on the back. So when there's a job that requires those rules, I have to load the Avery and watch it buckle and warp and prey there isn't a head strike.is the white/clear adhesive a deal breaker? there's some really great grey-backed conformable cast media out there and I've never seen my adhesive after install on glass but I use different vinyl for that application anyways.