Step 6: Apply Filler Material to Top Side of Bumper
Remove the aluminum tape from the top side of the bumper. Use the cleaning solvent to remove any residual adhesive. Use the 60 grit sandpaper to roughen up the surface of the bumper for one to two inches along the length of the crack. Use firm pressure and generously apply the filler to the top side of the bumper. Allow to dry completely.