Multiple coats of System Three marine spar varnish on the ply. Wouldn't hurt to varnish inner frame also, but that's ALOT of real estate with many surfaces. Maybe later on.
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Matthew 6:33

1952 Chevy 1/2-ton 3100
Late '55 235/SM420/torque tube 3.55
Dalton Highway survivor (using original 216)
www.truckwithaheart.com