You need to seal it off from air for it fo fully cure.
I've seen were some have said to add wax to the final coat of poly.I have been told not to sand it cause it will gum up the paper. That is why I bought epoxy. Can someone with more experience chime in please.
Thanks Ducknut, that's the answer I was hoping for. I just keep picturing sanding wet glue.Shallow, you will be fine. It might clog some but it won't be like sanding wet caulking.
Although epoxy is a better choice, many boats are repaired using esters.
If the hull is really thin then epoxy might be a poor choice as it flexes differently than ester.