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The top is two layers of underlayment luaun (sp?) plywood nominally 1/4" thick, but actually 3/16" thick, so the total thickness is 3/8". The sides are one layer of that plywood because the spans are shorter. Years ago I built a topper with one layer of 1/4" fir plywood. That one sagged between the ribs after a year or two.
All joints were glued with Titebond II or III or whatever. It's the latest and greatest Titebond.
After sanding and filling defects with Bondo, I sealed with one coat of West System epoxy. I buy it in the gallon resin / quart hardener size and leave the pumps on the cans. I use the 206 slow hardener. I've been buying it from Aircraft Spruce.
Sand off the high spots, spray on some sandable primer, use up a whole tube of spot glaze, finish the second spray can of sandable primer, and brush on gloss enamel from the local hardware store. Wet sand the enamel, brush on another coat, repeat until sick of painting, put on truck. Done.
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