Things You'll Need:
- Auto body filler
- Sandpaper (200 to 400 grit, dry/wet)
- Sandpaper (600 grit, dry/wet)
- Degreaser
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Step 1
Sand the area to be repaired with 400 grit dry sandpaper--just enough to rough up the surface to help the body filler stick.
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Step 2
Apply a thin layer of body filler to the dent and allow it to harden.
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Step 3
Repeat the previous step, allowing each subsequent layer to harden before adding the next. Keep the layers thin and feather the filler out at the edges to blend it into the undamaged surface.
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Step 4
Wet sand the entire filler area with wet/dry sandpaper (your choice of 200 to 400 grit).
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Step 5
Run your fingers over the dented area of the tank, checking for any bumps or dips in the filler. Even small variations will be noticeable after the area is painted. That said, repeat the filler and sanding process until the motorcycle tank is as smooth as you can get it.
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Step 6
Spray a guide coat of dark spray paint over the entire damaged area of the tank.
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Step 7
Wet sand gently over the painted area with 600 dry/wet sandpaper.
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Step 8
Note any darker blotches or bare spots in the painted area. Darker spots indicate a need for more filler, while bare spots will require more sanding. Repeat the entire filler/sanding/guide paint process until you get it just right.
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Step 9
Finish with a light wet sanding of the entire motorcycle tank using 600 grit dry/wet sandpaper. Wipe down the entire tank with a degreaser. The dent has vanished and the tank is ready for priming and repainting.
