mixmkr
Well-Known Member
If it don't leak....eh... water is usually meant to be on the outside of the boat. ;-)
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To find out, test some scraps for water absorption properties.From the grain in the blocks I think what you're using is expanded polystyrene foam (EPS - "bead board"). EPS readily absorbs water. What you want as structural flotation is extruded polystyrene foam (XPS).
kinda like the 2020 designs coming out next spring
'Wonder if that leftover remnant of expanding foam would've been better off used for pouring a narrow bead inside of an aluminum mast? (Expanding to add strength and permanent waterproof flotation).Remnants of the last batch.