Answer
Between latex paint coats, use 320 or 400 lightly after the paint is fully dry.
Why it happens
Light sanding removes nibs after the coat dries, but sanding too early can peel or gum the paint.
Recommended grit
Use 320 or 400 lightly after latex paint dries fully.
Wet or dry
Dry.
Success check
The coat feels smooth and dust-free before the next coat.
What to do
- Let the latex paint dry fully.
- Sand lightly with 320 or 400.
- Wipe the surface clean.
- Apply the next coat over the clean surface.
Avoid: Do not sand latex paint while it is rubbery or soft.