Don't know how isopropanol will work, but I suspect that it should be fine & he'll tell us his results. Ethanol and methanol (or mixtures thereof without water) have been used and recommended for eons and I think that's just part of the history and the way that shellac use evolved over 200 years.So my question; Will isopropyl alcohol work as well as DNA when working with shellac (Flakes or out of the can...)?
Or do we need to wait for Bill's testing???
Try your own tests in your shop and tell us your results for comparison.