Before the paints are mixed and the spray guns are loaded, it's always a good idea to go over your auto body project with a fine-toothed PrepPen to prepare your car for a long-lasting touch up. Have decals or bumper stickers that won't come off? Try an Excel Autobody Products eraser wheel, perfect for removing the stickers and glues underneath them. Seam sealers are also a plus to use, especially those from XL that cure quickly while you're trimming masking paper with an 8- or 13-point blade.