My DIY Random Orbital Sander gave up the ghost. Sanding back the entire hull of 2 part high build epoxy was beyond it. So I went out and got the Makita one I should have gotten in the first place.
I have also found that the weave on the glass cloth is a lot harder to fill that I thought. I have 2 coats of high build epoxy primer sanded back, and there's a few spots that will need special attention. I see another tin or two of High build Primer applied with a brush to the affected areas.
I'm starting to tire of sanding.