Hi TBers, I'm working on a project right now where I need to insert some styrene fillers in a model of a boxcab. The problem is, the shell I'm using for the boxcab is black plastic and the styrene I have is white plastic. I was thinking of using a Sharpie pen to darken it before I spray the base color on to aide in blending. Does anyone know if this would/could cause a problem with things like paint adhering to the plastic, etc.? Anyone have any experience with doing it this way? Any help is greatly appreciated. Thanks, Matt