Description Find pinholes in body filler and deep scratches in primer with 3M™ Dry Guide Coat. Our Dry Guide Coat helps to detect the smallest surface imperfections in the dry primer sanding process. It requires no masking before use and has no dry time after application. When sanding polyester filler, our Dry Guide Coat helps to visualise and ensure the filler is flat with no ripples and body styling lines and contours are straight and correct. It ensures the total primed area is sanded prior to top coating. Use for both wet and dry sanding. Dry Guide Coat contains no solvents.