Rub 200-grit sandpaper along the edge of your mantel in random areas. Rub until the wood grain beneath the paint has shown through.
Rub sandpaper in small areas on the face and top of the mantel to expose the wood grain. You can also expose the wood grain on any decorative molding on your mantel.
Use a clean tack cloth to wipe down the mantel.
Pour a small amount of glaze into the paint tray. Apply the glaze to the mantel with a paintbrush over the areas where you sanded. Wipe away the excess glaze with a clean rag. Continue applying the glaze, working in small areas at a time. Let the glaze dry completely before placing items on the mantel.