Answer
For finish prep, use the middle and fine grits from the assorted kit. Start around 180 or 220 for normal smoothing, then move to 320 and 400 before coating.
Why it happens
Finish prep can look confusing because the kit includes both coarse removal grits and fine finishing grits in one set.
Recommended grit
Use 180 or 220 for normal smoothing, then refine with 320 and 400 before applying finish.
Wet or dry
Use dry sanding for most wood, paint, and primer finish prep. Use wet sanding only on surfaces that can safely be rinsed.
Success check
The surface feels even, has a consistent fine scratch pattern, and is ready for coating.
What to do
- Clean dust or loose residue from the surface.
- Start with 180 grit only when the surface still has noticeable roughness.
- Use 220 grit for normal finish preparation.
- Move to 320 grit when the surface feels even.
- Use 400 grit for finer prep before paint, primer, or a smooth coating.
- Wipe the surface clean before applying finish.
- Stop when the scratch pattern is even and no rough spots remain.
Avoid: Do not jump from a coarse removal grit straight to 400. Deep scratches can remain under the finish.