I have been using the Windex method for years. I always heat seal the trim into place after 24 hrs. Lately I have gone to using Ultracote for the base color and Monokote for trim colors. Mon does not stick to Ulta as well but the heat takes care of that. I would prefer to use all Mono but after the change I have found it impossible to work with and get the high quality results I was able to get 10 years ago.