Answer
Do not sand a porcelain tub with regular sandpaper for cleaning or shine. Sand only as directed by a refinishing system.
Why it happens
Porcelain is a hard glazed surface; ordinary abrasive paper can leave visible scratches instead of restoring gloss.
Recommended grit
Do not use standard sandpaper for normal porcelain tub cleaning or shine restoration.
Wet or dry
Wet sanding should only be used as part of a specific refinishing system.
Success check
The tub surface is not scratched by unnecessary sanding.
What to do
- Do not sand the glazed tub surface for routine cleaning.
- Use the refinishing system instructions if recoating the tub.
- Keep sanding limited to the specified prep grit if refinishing.
- Clean residue completely before any coating step.
Avoid: Do not use coarse grit on glazed porcelain.