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I Googled "Pool Noodle Buoyancy" and got a forum where it was discussed. I didn't double check the math, but one guy figured that a 1 foot piece of 3.5 inch noodle would float a 4 lb piece of steel. So, by my figuring, (3) 5 foot noodles should be enough to compensate for the gear that is more dense than water.
There was also some mention of 2 part marine foam that looked promising. You mix the 2 parts together and pour it into the area to be filled and it expands to 30-1 the size. You could flip your yak over on some horses and pour that into the area on the outside of the leg wells. Would have to check if there is a reaction problem with the plastic used in yaks though.
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