I was watching a thing the other day on telly about tinting car windows, apparently a problem on cheaper films is shrinkage. only the more expensive stuff is shrink proof so may be worth checking if that is the case with this stuff before parting with a wedge.
don't worry about uv, most modern car windows have uv blockers in and all non prescription sunglasses are required by law to have uv blockers in for 100% of the damaging uv types (in uk anyway)
land101 ambie/camper/ wip
1968 morris minor traveller!
1990 Landcruiser H60. Full rebuild completed 2014
2012 Hilux, mountain top and bedrug with GG AT2s