Leather Duller 63 by Leather Doctor is a water-based polyurethane duller added to a gloss topcoat to adjust to a satin or matte finish.
How to use Duller 63?
- Warm up and shake well.
 - Mix thoroughly with topcoat accordingly.
 - Test for the desired luster when dry.
 
Update August 19, 2025 by Roger Koh