Remember that discussion about flotation built into in boats and how much safer they are? Today we put the flotation in. The decks and bulkheads were already sealed compartments, but if water ever got in there (and it would), it would never get out, and that would be a real problem. So I fill that void with a two-part polyester closed-cell foam.
First I drill 1" diameter holes reasonably close to each of the corners.
Then I mix up a cup of the two part foam and pour it into the void through the hole. Don't miss. Once in the void it heats up and expands about twentyfold or so, and takes about 10 minutes or longer to solidify so the next pour can be made. I spent a few hours doing this because the flotation compartments are a third of a yard or more each. The above picture is looking down into a hole to see the foam about half filling the compartment.
Finally. The compartment is completely full to the top.
I then cut the excess blobs off after the foam has completely hardened and easily sand it smooth. I'll lay a small swatch of fiberglass over each of those to protect them and it's now pretty impossible to sink this boat, even if it gets cut in half.
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