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Message: <blockquote data-quote="onthewater102" data-source="post: 457793" data-attributes="member: 13702">They're at least polyethylene foam so they won't react if gas spills on them. You just won't get any hull support from them, they'll certainly help float in an emergency. If they're 3" in diameter with a 3/4" cutout in the center and 5' long they'll displace a little less than a quarter of a cubic foot of water each. They're very low density, so probably 60 lbs of flotation per cubic foot would be a safe assumption. So you're looking at a little less than 60lbs of flotation for every 4 you add to your boat. 28 would be able to support about 400lbs of dead weight in the event your boat goes down. Just need to install them relatively evenly around in the boat and concentrate them only in areas that bear a lot of weight (near your battery compartment and transom for instance.)</blockquote>