Answer
If spray primer feels rough, smooth it with 400, then 600 before paint.
Why it happens
Dry spray, overspray, or dust nibs can leave texture that needs light smoothing.
Recommended grit
Use 400 or 600 to smooth primer before paint.
Wet or dry
Dry.
Success check
The primer feels smooth and is dust-free before paint.
What to do
- Let the primer dry as directed.
- Sand rough texture with 400.
- Use 600 for smoother final prep.
- Remove all dust before painting.
Avoid: Do not paint over gritty primer texture.