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.188? Your fucked, youll never be able to countersink a screw in .188...
But anyways, you do want coping to protect the edges, i used 1" PVC on the sides of my box
your only option is to glue it down, thatll work.
Go to home depot and tell them you need to glue a plastic sheet onto plywood and have it stay and see what they have.
holy shit you go so ripped off...
i got 2 pieces of 4x4 3/16th pieces for that much