Thanks, Dave.

Understand the 'inside sanding' now.

For the epoxy, I chose to just squeegee it on and let it air dry. Mixed it as planned and spread it around with a squeegee. I'll sand it smooth. The color will be off a bit. Could do the polyurethane paint thing. It would be hard to get a color match. The only place locally that sells 2 part poly is a marine store that doesn't mix paint. It would be $50 for the paint, $25 for the epoxy barrier coat. Would a paint store be able to match 3rd party poly? Or would I be able to do that? The pigment I have mixed with the epoxy is too white, at least compared to the top layer of gelcoat. I did notice while grinding that the gelcoat underneath was a bit brighter. And the hulls hadn't been cleaned recently.

Or what would happen if I just sanded smooth and left it like it turns out? Tackle the paint/color job later?

Take care,
Danno