previous owner not smart. removing cured insulation foam
It does look much like bondo. regardless I use 24 grit rollock disks in a right angle air drill. I have used them in regular drills. the small 2 inch disk cuts right through rock hard filler.
a rotating grinding disk will tend to work best. I have a heavy wire wheel that I put on my 4 inch makita grinder, it to hogs out filler and what ever els might be in the way quite well. take your time experriment. Kevin:coffee2:
