Window perc can turn out to be a nightmare sometimes. i had to install some window perf that was froggy juiced. The vinyl was soft as hell and the florida sun was hitting us throughout the whole install. I never had such pain installing perf never ever. I really thought im just going to trash the piece... anyway. I do the same backing
paper cut with the bodyguard knife. only difference is that I do not tape up the vinyl.i cut the backing
paper twice 5 inches below the top of the vinyl. Cut the
paper 1 or 2 inch apart then remove the 1 or 2 inch backing
paper strip. As I said do this like 5 inch away from the top so you will have a lot of liner on the bottom,your exposed strip and 5 inch liner on top. now you can position the vinyl without sticking everywhere. Once you have a good position just tack the exposed part down. then fold down the top part. remove the
paper. install that piece then do the bottom.
------- top
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------- cut here 5 inch below the top
------- cut here 1-2 inch below the other cut then remove the strip
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-------bottom of the vinyl
If its a pain or the sun hitting the vinyl then maybe try to put transfer tape on it? maybe?