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I would personally leave it Rob. You would hate to have to cut your deck. IF you can't hardly notice it and you only had a little sweat of water appear, it is unlikely you have a serious problem yet. Sometimes glass gets pin holes, i am not a great fiberglass expert, but I have heard of it, I don't know why or how, but a coating of resin should fix pin holes. Beware however, because resin alone does not provide much strength without some fibers or something, much like concrete without rebar.

The only thing you have to find out is if you have delaminated glass.

If you do, I would drill a small hole in the deck, just big enough to ream out some of that old foam with an allen wrench chucked into your drill. At this time, I would use my epoxy recipe from my project album and fill the hole with a syringe as much as possible, then cover the hole with some packing tape. Immediately after that, set something really heavy on the area to depress it and let cure. once cured, you should be able to sand off the bit of overfill and then paint or gelcoat a small spot to conceal the hole.