Made closeouts for butt ribs out of 1/4" plywood. After shaping and sanding I applied a coat of Stewart Sytems primer to the ribs and closeouts then I glued them in place. So far I am really pleased with how easy the Stewart Systems primer is to work with. Painting is not something I enjoy at all but this system seems to be the most forgiving to my poor skills. I used a cheap Kobalt spray gun I bought at Lowes with good results.