Answer
For motorcycle tank paint prep, use 320 or 400. Use 600 for finer topcoat prep.
Why it happens
Curved painted metal needs controlled sanding so the surface is dull and smooth without cutting through edges.
Recommended grit
Use 320 or 400 before primer or paint. Use 600 for finer topcoat prep.
Wet or dry
Dry for prep; wet at 600 when the coating system allows it.
Success check
The tank is clean, dull, smooth, and evenly scuffed before coating.
What to do
- Clean the tank surface thoroughly.
- Scuff with 320 or 400.
- Use light pressure around edges and curves.
- Use 600 for finer topcoat prep.
Avoid: Do not use coarse grit right before paint on visible tank surfaces.