This morning I installed some Porsche lettering on my rear spoiler. For some odd reason I couldn't get anything to stick on the surface. Some citrus cleaner did the trick. I had some Silver sign vinyl laying around and it actually matches my Boxster S lettering on the truck lid. Spoiler curvature took a little while to get right. Might change it out to 'Boxster S' in the future. Used to do this vinyl graphics stuff in a business we had and wisely kept some of the equipment.