It always amazed me how I never could dry out a saturated hull. After removing a cap, most of the fiberglass skins over voids, even dig out most of the foam, still, till all the foam is out all of the water won't be. I gelcoat the bilges of my projects because I feel the porosity of bare fiberglass allows water to permeate the fiberglass migrating into the foam. A 2# foam does help provided hull spine integrity, torsional strength, and noise dampening IMO.