Took that orbital back and got a angle grinder with 40 grit disc. Very easy to take off too much now, but I managed. What do you guys use?

The first hull now has a 1/4" x 9" long gap in it. Moved the cat into my garage and am drying it out with a blower T-ed to both drain holes. Plenty of air moving out the bow cracks now. Douched cracks with acetone too and wedged smaller cracks open with nails. Continued after pic post...