Answer
Scuff sanding sealer with 320 or 400 after it dries. Use light pressure and remove all dust.
Why it happens
Sealer raises fibers and fills pores, then needs light leveling before topcoat.
Recommended grit
Use 320 or 400 after the sealer is dry.
Wet or dry
Dry.
Success check
The sealer feels smooth and level without bare patches.
What to do
- Let the sanding sealer dry fully.
- Scuff with 320 or 400 using light pressure.
- Remove all powder and dust.
- Apply the topcoat after the surface feels smooth.
Avoid: Do not cut through the sealed surface with coarse grit.