Answer
For laminate before painting, clean first, scuff with 220, then refine lightly with 320.
Why it happens
Laminate is slick and non-porous, so paint needs a clean, dull surface to grip.
Recommended grit
Use 220 to scuff laminate, then 320 for a finer primer-ready surface.
Wet or dry
Dry.
Success check
The laminate looks evenly dull with no shiny patches before primer.
What to do
- Clean grease and residue from the laminate.
- Scuff the surface evenly with 220 grit.
- Refine lightly with 320 grit.
- Remove all dust before primer or paint.
Avoid: Do not paint over glossy laminate without sanding.