I bought a bottle of this a while back and never had the nerve to use it, but for some reason I tried it out today! I just painted it directly from the bottle onto the windows. As it jellified, it was easy to push any that overlapped the window frames back. Paint it on thick so it all pulls off in one even piece.

A few hours after spraying when I knew the paint was fairly dry I started to lift it

It came off very easy and didnt stick to the inside frames where it was already painted

All pieces came off easily. It feels like an elastic or silicone type material when dry. Perfect result first time. I would recommend this stuff for masking off difficult areas where it might be easier to paint in the area than cut some masking tape!

Just thought Id share the tip with anybody who was interested in this product and wasnt sure how or if it worked. Its something I´ll definately be using again!