Answer
Remove dried glue with 120 or 180, blend the spot, then finish with 220 before staining.
Why it happens
Glue spots seal the wood surface and need careful removal without digging into the surrounding wood.
Recommended grit
Use 120 or 180 for dried glue, then 220 for final wood prep.
Wet or dry
Dry.
Success check
The glue spot is gone and the wood absorbs finish evenly.
What to do
- Scrape thick glue carefully first if possible.
- Sand the glue spot with 120 or 180.
- Blend into the surrounding wood.
- Finish with 220 before stain or finish.
Avoid: Do not leave glue residue before staining.