Answer
Use 180 to 220 before painting. Use 320 to 400 for primer or between-coat prep.
Why it happens
Paint needs a clean, even surface with enough tooth for the coating.
Recommended grit
Use 180 to 220 for general paint prep. Use 320 to 400 for primer and between-coat prep.
Wet or dry
Dry for paint prep.
Success check
The surface is clean, dull, and evenly sanded before paint.
What to do
- Remove loose material first.
- Sand rough areas with 180.
- Use 220 for general paint prep.
- Use 320 or 400 for primer or between-coat prep.
Avoid: Do not paint over dust, gloss, or loose coating.