Description
Osmo Hardener 6631 for Oil Stain is a clear additive that speeds up the drying of Osmo Oil Stain to approx. 3–4 hours (23 °C, 50% RH). For use only with Osmo Oil Stain.
Application
Add the hardener (0.06 L) to 1 L of oil stain and stir thoroughly. If you only use part of the tin, add 6% hardener and mix in a separate container. Pot life after mixing is under 60 minutes – only mix as much as you can use within 45 minutes. Otherwise follow the Osmo Oil Stain instructions. Coverage does not change.
Safety
Flammable liquid and vapour. Harmful if inhaled. Contains isocyanates, may cause an allergic reaction and respiratory irritation. Keep out of the reach of children and away from sources of ignition.
Documents
- Osmo Hardener 6631 for Oil Stain – product information (PDF, in Estonian)
- Osmo Hardener 6631 for Oil Stain – safety data sheet (PDF, in Estonian)
Documents in other languages are available on request.

