Spraying the adhesive side of Monokote with windex "activates" the adhesive, but still allows you time to position and reposition the covering on top of existing Monokote. Then, after it dries, you can run over the covering with an iron for permanent adhesion.

BTW - I read somewhere that Windex only works with Monokote. I think it was in one of Minnflyer's posts...