Answer
For stainless steel, use 220 or 320 for prep, then 400, 600, and finer grits for refinement.
Why it happens
Stainless steel needs controlled scratch refinement and clean sanding steps.
Recommended grit
Use 220 or 320 for prep, then 400, 600, and finer grits for refinement.
Wet or dry
Dry for prep; wet for finer stages.
Success check
The scratch pattern is even and controlled.
What to do
- Clean the stainless steel surface.
- Sand in a consistent direction.
- Step from 220 or 320 to 400 and 600.
- Clean before judging the finish.
Avoid: Do not change direction randomly if a consistent grain appearance matters.