Answer
Before painting, remove loose dust, wipe clean, let the surface dry, and paint only when it is dust-free.
Why it happens
Loose dust blocks adhesion and creates small defects under primer or paint.
Recommended grit
After final sanding, keep the same final prep grit and focus on dust removal before coating.
Wet or dry
Dry dust removal after dry sanding; clean wipe after wet sanding.
Success check
A clean hand or cloth picks up little to no dust before painting.
What to do
- Vacuum or brush off loose dust.
- Wipe with a clean dry or slightly damp cloth suited to the surface.
- Let the surface dry completely.
- Paint only when the surface is clean and dust-free.
Avoid: Do not paint over visible sanding dust.