My two cents. I have refinished several bows from old junkers to nice ones. I dont suggest "spot" fixing the bow. I would sand the entire riser down after you reshape the area in question, including the sides of the limbs. Get some GOOD outdoor spray poly and put at least 5-7 coats on the entire bow tip to tip. I use satin exclusivley, it keeps the glare down and looks very nice. I have heard "stay away from the glass", I always sand the ENTIRE bow. Its wood, dont be scared to play around and learn, you cant hardly hurt it if you go slowwwww.