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Message: <blockquote data-quote="DaleH" data-source="post: 418586" data-attributes="member: 15636">Wow, surprised to hear that! I added below what their FAQ on their foam states - emphasis added. Looks like anyone using their foam or a similar foam must be sure there are limber holes or drains in the hull to ensure any water into the bilge cannot become trapped.14. Is this foam water resistant?   Source = https://www.uscomposites.com/faq_foam.htmlYes, but with the following caveat. The foams that we sell are considered closed-cell, which means that each cell that makes up the foam structure is completely closed off from surrounding cells which prevents it from acting like a sponge. It is completely safe for this foam to be in contact with water for hours/days/weeks and even months with no adverse effects. However, it should never be submerged in contact with water permanently. Over a period of years the water contact can begin to soften the foam and cause it to lose its closed-cell status. This foam is designed primarily to be used as an insurance policy in case of damage/holes that could cause a vessel to lose buoyancy. Pinhole sized openings would essentially have no effect on the foam since the amount of exposure is so minimal but you should always make repairs as soon as possible to keep the foam effectiveness as good as possible. This will be the case with all after market closed-cell polyurethane foams and even manufacturer installed foams.</blockquote>