So, I've read on several occasions in Scale Auto Mag, this site, and other locations, of people using Sharpie Markers to mark the trim on model car "glass". Am I doing something wrong? Is there some other type of Sharpie that I'm not aware of? I'm using the standard permanent markers that you see at office stores, Michaels, Wal-Mart, etc. Any help or advice would be appreciated! thanks!