Most boards are finished with shellac. Brushing or spraying on a light coat of shellac will probably restore the finish like new. Light sanding with fine sandpaper, such as 400 grit, before and between coats will help, too.
Should you wish to strip the finish completely, shellac dissolves in alcohol.
Please beware that we apply any paint on your board between layers of shellac, so stripping back the finish may remove paint, too.
We rarely use polyurethane to finish boards, particularly those with pad auk wood and similar alcohol-soluble natural coloring. Even with this finish, a fresh layer of shellac on top should work fine.
REMOVING THE FINISH WHILE THE PRODUCT IS UNDER WARRANTY WILL VOID THE WARRANTY