I have tried using chemical strippers on polyurethane, I found that the stuff we can get over here barely had any effect. Bearing in mind that we are not allowed to get the old fashioned strong stuff unless we are a professional company. Then the cost of shipping hazardous chemicals comes into play.Use chemical stripper and mask the bridge off, this is the main area you should do most of the hand sanding. The chemical will strip the finish, and you will want to use a plastic scraper...one wrong move with a metal scraper and the guitar will get dinged quite bad. I would suggest using the lodge brand cast iron scraper, they are a hard polycarbonate scraper.
In fact there are some professions who finish the body with nitro (or other finish) and french polish just the top. There are a number of reason for this. The top is the bit that benefits most from a really light shellac finish. The back and sides get way more wear and tear rubbing constantly against the players body and a finish such as nitro is harder wearing. In a workshop where many guitars are being finished then this method is more economical in time. Only the top gets the most timing consuming finish. In some ways this mixed finish is the best of both worlds.Philosopherguy wrote:I imagine just refinishing the top would accomplish what you may want. (…)
I recommend investing in a good luthier built guitar that is french polished. It will not keep you up at night wondering if something is getting 'choked' on the guitar!MarkInLA wrote:Hi. Not saying I'm going to, but if one did, how would the entire polyurethane finish be removed ? I'm guessing that chemical is a no-go as it could would affect the glues in all the visible areas; bridge, binding, purfling, rosette. If so, then I assume it's going to be sanded off. Yes ? I have this idea to refinish my Cordoba C10 with an organic substance; lacquer, varnish, (is it ?) French polish, other. I realize the poly finish may preserve the instrument for a longer time, or that it just goes on so evenly and dries quickly. But I keep wondering if the 'plastic' coat might be choking the wood's pores; that it would sound even better than it already does with a different coating. At the same time I am aware that the poly is very very thin and thus unlikely has any affect on the sound. Dibbs ?... Thanks, Mark
from my refinishes i have done, yes it is choking the sound, and often HUGELY. if you do it yourself it is worth the effort.Moje wrote:The urethane isn't choking the sound, any audible benefit will be purely imaginary. A refinish on a C10 couldn't possibly be worth the money or effort.