You cannot use just any type of foam to replace it. Today I am working on removing all of the old closed cell foam that was on the inside of the hull. If you are concerned that there is water retained in the foam between the inner and outer hull, the next time you have the boat on the trailer for an extended lay-up, drill a 0.25-inch hole into the hull in the region where you suspect there is entrapped water. Wet Edge topside paint adheres to fiberglass and wood like wet on water, and expands and contracts effortlessly with your ever-shifting hull. Some types will absorb water like a sponge, rendering it useless as floatation and adding mucho weight to your boat. I would not start cutting into the hull because the foam surrounding a drain tube was damp. For tougher stains, he uses On & Off Hull & Bottom Cleaner. It is porous and absorbs water, you will need to let it air dry for some time. Once the boat is dry, he removes any deck hardware that isn’t through-bolted—including cover snaps—and tapes off the windshield edges. the rotted floor allowed the water through and by the looks of it sat … The fact is, most have moisture levels which are higher than when the stringers were installed. The surveyor discovered wet hull core with a moisture meter, and subsequently pulled hull fittings and portholes to physically reveal the wet balsa core. The mold is first sprayed with gelcoat, then fiberglass cloth is applied, and then resin is used to saturate or “wet out” the fiberglass. Tim returned the deposit to the buyer, who left angry. also make sure that the drain channels in the hull are clear and prop the boat up so that the excess water can drain out. A spray bottle with water will keep the hull wet as work your way around the hull. If you are not concerned with structural aspects the type of foam used for pool noodles is the best. It is two liquids which when mixed together create an expanding foam, ideal for irregular contoured cavities. With fiberglass boat building, however, the major components of the boat – the hull, deck, liner, and large parts like consoles—are molded from fiberglass. The foam in a boat is basically a type of the same foam used as insulation, in the boat used as floatation. Other one-part topside paints can lift, peel, or crack under this type of pressure. Usually, this means starting with a female mold. He starts a project by washing down the boat with a dish detergent like Dawn to remove any oil and scum. Take care to prevent rot and the boat … Myth: Wet readings on stringers mean the boat hull is junk. And he was stuck with $95,000 worth of unsaleable boat. ... on solid laminates. If that were the case, then most every boat with wood stringers would be junked. The two part foam will absorb water and act as a structure in the hull, but even though it is wet it will still float. 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