My chaparral is the second boat I've owned, and I'm at 100% with water in the foam. Both are open bow with a ski locker and the foam is filled beside each stringer. The problem in both my boats is once water gets in, it can't get out. I put drain passages in my first restore, (glassed), through the stringers with 3/4" pvc near the stern. That way if moisture does form, if I store with the bow high it will drain. I hope to be doing the same on the Chap. I know water should never get on the outsides of the stringers, but if it does, it needs a way out in my opinion.