[speeder]

Randy, The only way to safely remove polyurethane, or most other varnishes, is with chemical stripper and a good scraper. It's nasty stuff, so make sure to use it in a well-ventilated area or you'll wind up like Mul.

On these particular windows, I thought that I would have to use stripper on, but the old varnish just scraped off dry. Mind you, I have the best tools available, (carbide blades), they are REALLY sharp, and you have to use care like you are de-fusing a nuclear bomb w/ wood this valuable.