With 2 coats of resin on the inside, do you typically sand before varnishing? It seems if I sand I will quickly go thru the resin and into the glass.

Yes you need to sand the inside before the varnish to get a mecnaical bond. I use a satin on the inside so I dont get sun reflection. Gloss on the outside.
CB

I usually just scuff it by hand with fine sandpaper to give the varnish something to adhere too. It doesn't take long since you don't have to be perfect.

Alan

I'm with Alan, just a light sand by hand.
Don't tear it up, just scuff it.

Wish I was that close to being done. Have flotation chambers and trim to do. At least my seat is done.

Jim

Thanks guys! I'll ask one more question but I think I know the answer. Somehow, I've ended up with several spots where the resin pooled in the bottom causing raised "bubbles" of resin. I did not notice them until I put the second coat on for some reason. My light must not have been good enough to expose the areas until they got shiny again with the second coat. Anyway, it looks pretty bad but I'm willing to live with it unless there's an easy fix. The way I see it, I would have to sand down the raised areas, thru the glass because it also lifted in some spots and patch those areas. I'm not sure it's worth it. I don't see that it would structurally be an issue?

Use satin finish, like Cedarboy mentioned, and they'll hardly be noticeable. I wouldn't bother trying to fix them myself.

Alan