Mirka Dry Guide Coat Black 100G, Qty. 1 The Dry Guide Coat has excellent covering properties. The powder makes all imperfections and scratches visible. This unique applicator leaves an even powder coating. The applicator has flexible edges which makes it easy to use on contoured areas. This is a great tool in guiding the operator through the sanding process and achieving a perfect result. The black powder is used for light color surfaces.