IMHO true FP is a weaK finish IF you are a consumer of alcohol - particularly spirits, they will sweat onto the neck and other parts of the uke a 'solvent' that will turn the FP into mush over time. Like all truly organic finishes it is great to look at, and, if it is never handled will remain fabulous. It is the only finish that provides a depth and luminosity that enhances the grain and figure of a piece. BUT, and I had French Polishers finish my furniture when I made it (who were also ace off-the-gun sprayers) so this comes straight form the horses mouth.. I quote from Dave: "it is a finish which needs constant maintainance. Every year, we (that was Dave and Colin his business partner and ace French polisher also) had to go up to London to all our bosses clients' to refresh the skirting boards and architraves, dressers, chairs, tables and beds.... basically all the furniture and woodwork that had been French polished. This piano (pointing to a grand piano that they were black French Polishing working either side and meeting in the middle with no evidence of a join) has an 'acid finish' which gives it this really bright look. In 6 month's time it will need doing again. Try and persuade your clients to have a modern finish...."
Although environmentally friendly, superior in look when it is done right (spiriting off to amalgamate all of the applications and remove the lubricated mineral oil that should be used in the classic technique) it is fragile... Very few clients would take the care to keep an FP finish pristine so nitro it is for its working properties and durability in my workshop. All the best with discovering how to use this finish.