I was liking the wet application, I did a whole big sign on polycarbonate without any problems, but today I tried it on the rear windshield of my van and it was nearly impossible to get the vinyl to stick. I squeegeed and squeegeed as firmly as I could, and it seemed like there was no adhesive at all. Came right off with the backing. I finally scrapped the decal, made another one, and applied it dry. Do any of you guys use wet application for glass windows and if so, what might I have done wrong?