As long as you clean off the ash at the end I couldn't see any issue with it, give it a light buffing to knock off any rough/loose bits and then wash them off to not stain yourself or clothes. assuming you don't accidentally go through all of the finish it's fine, but if you do it's easy to make again. It does improve grip on things as well so depending on the type of furniture it might be weird, but what's the harm in testing?