What Grit to Use for Sanding Between Seal Coats of Epoxy When sanding between seal coats of epoxy, the key is to use the right grit of sandpaper. Using sandpaper that’s too coarse can leave scratches that are visible in the final finish, while sandpaper that’s too fine won’t rough up the surface enough for the next coat to properly adhere. The ideal grit for sanding between seal c... https://epoxyclassesny.com/use-a-palm-sander-to-sand-seal-coat-epoxy/