Morning all. Currently working on a resto of a medico bent billiard that requires my first attempt at stripping and staining the briar. The pipe has a glossy/varnished finish over stain. It's been soaking in 99% isopropyl alcohol for about eight ours and the finish does not appear to be coming off. Did I need to sand the glossy finish off before soaking? As always, your collected wisdom and advice will be much appreciated.