Answer
If plastic primer feels rough, use 600, then 800 for finer visible prep.
Why it happens
Overspray, dust, or dry spray can leave texture that needs fine sanding.
Recommended grit
Use 600 for smoothing plastic primer, then 800 for finer visible prep.
Wet or dry
Dry or wet only if the primer instructions allow it.
Success check
The primed plastic feels smooth and is clean before paint.
What to do
- Let the primer dry as directed.
- Smooth rough texture with 600.
- Use 800 for finer visible prep.
- Remove dust before paint.
Avoid: Do not sand soft primer that still gums up.