Report Letter & Number Decal Sheets in General Modeling Posted April 12, 2019 As far as using the Woodland Scenics dry transfer lettering as a mask, I can add that this is now problematic. The letter sheet has some sort of adhesive applied to it to apparently to keep the backing sheet in place until you decide to remove it. This adhesive must have some pressure sensitivity properties, whether intended or not, and it more or less makes the application of the letter to a surface permanent. I experimented with WS US 45 degree letters as a mask and I could not get the letters off the surface again. Even attempted to use a hobby knife point to encourage the process, and failed miserably. So be forewarned, it may not work for you. Test first. It used to be a neat and easy way to mask for letters without the clear decal film being an issue on natural metal paint schemes. I do not have any experience with any other manufacturer of dry transfers. Rick L.