Tip: If you can make that second pass so that you just barely overfill the hole, apply a 4-milliliter sheet of polyethylene film (from a nursery or good hardware store) over the repair. Let cure. The next day peel the plastic, which won't stick to the goop you applied. If the stars are aligned, your repair will be clean, super smooth and you're done (you might need to use a Scotch-Brite pad to clean up any slag stuck to the area surrounding the repair area). If you chose not to use the plastic sheet trick, or the repair is rough, wet-sand with a sanding block, starting with 120 grit and working your way to 600 grit. Use the block because hand-held sandpaper will scour out your repair area, creating a depression that will show, at least in sunlight. Then apply rubbing compound, then the wax of your choice. The repair should look good.