John,
Do you know how the stringer foam got wet in the first place? When I took off the floor of my boat, both stringers were saturated. On the port side, where the fuel fill line crossed the stringer, the glass had delaminated and was letting in water.
I was thinking like you are and drilled holes to allow the foam to dry out. Two MONTHS later, water was sill coming out of the holes.
I finally decided to cut out the tops and completely re foam. It is impossible to describe the weight difference between the still saturated foam and the dry. I couldn't believe it.
It was time consuming and expensive, but I'm glad I completely fixed the problem.
This foam looks dry, but it wasn't, and it weighed a ton.
