shellac over old shellac
The trim and back of each step in our entry hall stairwell is original and very worn shellac, steps are worn down to the wood in the center. Do I need to remove all of the old shellac before I apply more? I have been cleaning it up with alcohol & 3m pad but to get it all off is going to take some work in an awkward space. If I don't remove all the old shellac will it show? Clearly this is all new to me. Just bought a big 'project' house. Thanks for your help.