I am restoring a pair of extremely valuable vintage Yamaha NS 1000 Ebony wood speakers and this is the only product I trust to remove the old urethane finish without damaging the rare zebra striped wood veneer. I have many years of experience with this Circa 1850 paint stripper & yes I have tried other so called ‘greener’ products, only to realize that they worked so poorly that all that extra scrubbing was having a visibly negative effect on the wood veneers themselves, (not to mention the unnecessary extra sanding), Ugh!!! Never again! Circa 1850 Heavy Body Paint & Varnish Remover is the only product I use now. Just pour a bit of Circa 1850 on the surface, gently brush it in, & it literally melts the old finish away with minimum effort right before your eyes. Then wipe it off with a hand full of paper towel. The results speak for themselves. Use only in a well ventilated area and wear PPE and you'll be fine. Cheers, Joe