Anthony, it's up to you but I would undercoat. No way in hell I would use white either lol. Factory was black I believe. I just want protection, not going for show. Wont be any mirrors under this car, only if it has coke on it lol.
Just ordered the Proform Rusfre Bb1013-1 Brush-On Undercoat Gal from Amazon. goint to be doing small areas at a time and thought the brush on would be a better fit for this type of application.
