The temperature in Phoenix finally went below 100* and I was able to install the window tint to my 2002 Pontiac Firebird. I have applied decals in the past, putting a hood size screaming chicken on a 1979 Trans Am and lettering and striping a fire department fleet. So, I'm not a decal expert I have some successful experience. These tint decals were a bear to work with. The rear window ended up horrendously creased, party because the decal was a smidge too big for the window and needed trimming after window and adhesive were wet. Side windows went well for 2/3rds of each side and then just creased up on us.