3M Dry Guide Coat Cartridge 05861 (with applicator pad) is used prior to priming and sanding to identify surface imperfections, such as pinholes and deep scratches. Coat can also be used over primer to identify surface imperfections before paint. The carbon black powder can be used on automotive and marine fillers, primers, paints, and gel coats. Early detection means you can correct problems before they become bigger problems. Unlike liquid and aerosol guide coats, this dry guide coat requires no masking and no dry time. Enjoy an easy, fast application. Dry guide coating contains no added solvents, so it won't clog sandpaper, and the dry consistency makes cleanup easier. The carbon powder highlights body styling lines and contours to ensure that lines are straight and confirm that the total primed area has been sanded prior to top coating. Don't compromise the quality of your job and risk costly rework. Get great results the first time with 3M Dry Guide Coat Cartridge 05861.