I had a bow with black walnut lams and clear glass. I covered a few tiny air bubbles with some water based walnut stain. I started on the glass, then touched up the satin finish between coats until you could not see the bubbles anymore. Be sure to blend the stain with the grain of the wood. I used a q tip. I have another clear glass bow with died yellow lams (too mimic freshly cut osage). The glass has a few imperfections. I am going to try the same thing with some yellow dye. I will let you know how it turns out.