Once the epoxy is cured, it's impossible to fix improperly wet out glass. The glass fibers are coated with epoxy on the outside and and cannot abosorb anymore to fill the internal gaps.

That said, is the glass on your boat not properly wet out or is it just that the weave is not filled. That's 2 different things.

If the glass is transparent but you can see/feel the weave, it's properly wet out and just needs the weave filled.

If the glass is not transparent, if it has white streaks or patches, it's not properly wet out and it cannot be repaired. All you can do is remove and replace it. In that case, sand all the way down to the wood and glue on a glass patch.Let the patch overlap a couple of inches onto the old good glass. If you mark out the boundaries with 2" wide clear plastic packing tape, you can let the new patch overlap onto the tape, then when it's cured to the "green" stage pull it off the tape and cut off the excess. That will leave you a nice clean edge that will be easy to feather. Here's a couple of pictures of that same process being used to cover the edges of the rudder box on my schooner.

Good luck,

Laszlo

Thank you, Laszlo.

I suspected that may be the case. Yes, it's smooth but has white ghosts of weave visible inside.

If it really starts to bug me I'll paint the hull and bring the paint line up over the sheer to cover it. I can't say i'm keen to take it all off. I'd build a whole new one from scratch before I'd take on that repair. :-)