Epoxy VS Polyurethane for giving a Smooth Finish to Epoxied Fiberglass Veil

[LittleCleo]

This past weekend I took the time to refinish my Souris river canoe. The underside of the ribs was experiencing a lot of wear, so I contacted the rental store where I bought the canoe. Their maintenance guy suggested putting strips of fiberglass veil on the underside of the ribs while doing the epoxy coat.

I kind of regret this decision since the veil left a very rough surface on the underside of the boat. I am going to sand it down and refinish it. This being a lightweight (41lb) portaging canoe I would prefer to keep the weight down.
Looking for advice here. Will sanding the bottom of the hull and coating with polyurethane give me a smooth fast finish, or do I need to apply another layer of epoxy?

PS for anyone curious the boat is 90% Kevlar but the outermost layer is fiberglass which is why you can sand the outside.

PICTURES:
https://imgur.com/gallery/RELBq

Thanks

Al