vanillabear?, funny you should mention Zinsser brand. I think that's the brand of shellac I looked at today at our True Value Hardware store. I may buy acetone or denatured alcohol, too, to wipe it down first.
Another question for bow builders: where the end of the handle overlay meets the glass is a hard place for me to sand. It's like a little dip. I am afraid the glass will get too thin if I agressively sand the end of the overlay to feather it out.