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Message: <blockquote data-quote="waterant" data-source="post: 515780" data-attributes="member: 34810">I considered construction foam, but a semi-decent one like FOAMULAR Rigid Foam Insulation Board 2" x 24" x 96" is $50 per sheet. Two sheets for two floats will be over $100 with tax. plus ~$60 for a gallon of good glue plus converting material. so it will cost over $200 (at least in Canada), plus very messy work of covering with bedsheets, trimming, sanding, filling the gaps and painting.If the water seal breaks, it will absorb water quickly and be a pain to remove and replace.and there will be a gap in the seal because you can not rely on the glue and have to use thru-bolts to attach the floats to the hull.For an extra $240 you can use the proper material that does not absorb water, does not need any covering or paint, and can bump into things without worries about breaking the seal.Another option is a 6" DIA PVC pipe sealed on both ends. The front end can be heated and formed into something other than a flat pipe end, filled with <a href="https://www.homedepot.ca/product/lepage-tite-foam-gaps-cracks-spray-foam-insulation-sealant-interior-exterior-340g/1001042349" target="_blank">Tite Foam</a>; some brackets and straps over the pipe (to avoid the holes) can be used to attach the pipe to the hull and I'd put a drain plug at the end. Will cost approximately the same as construction foam without all the mess and will be much more rigid.</blockquote>