Answer
For tile before painting, clean first, then scuff lightly with 400 or 600 before bonding primer.
Why it happens
Tile needs cleaning and very light scuffing, but aggressive sanding can damage glaze.
Recommended grit
Use 400 or 600 lightly to scuff glossy tile before bonding primer.
Wet or dry
Wet or dry with dust control.
Success check
The tile is clean, lightly dulled, and ready for bonding primer.
What to do
- Clean soap film, grease, and residue from the tile.
- Test a hidden area first.
- Scuff lightly with 400 or 600.
- Remove dust before bonding primer.
Avoid: Do not use coarse grit on glazed tile faces.