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The mechanical properties of the adhesive aren't really the same as epoxy. Epoxy tends to dry to a very hard solid form. Most of the polyurethane adhesives tend to stay fairly elastic and flexible. You're trying to stiffen the cockpit sole, and a flexible adhesive isn't really going to do it.
BTW, Liquid Nails tends to foam a bit and take up space, but the material really isn't all that strong if it isn't in direct contact with a surface from my experience working on my sister-in-law's condo.
What you need to do is cut the laminate, dig out all of the bad core material, lay in new core material—either end-grain balsa, Airex or Divinylcell foam—bedding it in a thin layer of thickened epoxy to adhere it to the lower skin, and then glass over it, creating a new cored laminate to re-create what was there originally.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Still—DON'T READ THAT POST AGAIN.