Re: Proper Tool for grinding blisters
I used a round tipped burr on a drill to do mine. It chewed through the glass pretty easily and left a nice rough surface for bonding. I have tried rotary wood rasps on glass too, but the ones I had were cheap and wore out quickly.
I doubt you are going to melt the fiberglass with high speed, but you don't need 10,000 rpm! Just slow it down a bit!
1979 Santana 30 Tall Rig