Let this dry for 24 hours, and then you can take the polishing cloth included in your kit, and VERY GENTLY wipe down the piece. This will help remove any metal particles that are “stacked up” on the surface, but not really stuck to anything. The material is so finely ground (near molecular scale) that you can actually wind up with a fair amount of this material (depending on how heavily it was sprayed) on the surface, that is not stuck to the clear coat on the black. It is just sitting there like a “nano-dust”. WHEN TOP COATED THESE LOOSE PARTICLES WILL FLOAT UP INTO THE TOP COAT, AND HURT THE REFLECTIVITY VERY BADLY.