Those prices for divinycell and corecell seem backwards. Corecell is better for heat/impact (better everything really). Dark nonskid could become a worry with heat but no one in their right mind would do that…
Any of those cores will be just fine for that purpose. Coosa makes a 15 and 20lb too, but I wouldnt use coosa if i was tryin to save pounds.
Ive done decks in all those materials but for my money itll be handlaid honeycomb. Its got good compressive properties which is what ya want. You wont notice any difference in the boat between honeycomb and the foams to justify the cost. The foams might be a bit quieter but not enough to notice. More work to deal with the open cells when ya cut for a hatch but not much in the grand scheme.
They make the honeycomb with and without a membrane underneath the scrim on top of the open cells. Get the one with the membrane as it blocks resin from draining into the cells.
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