Coating exposed luan plywood with ??
The floor of my trailer consists of 2" of styrofoam compressed between a top layer and bottom layer of 3/16" luan plywood. The bottom layer of the floor was wrapped and glued with a tarp like material...
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I'd brush on a coat of ROT DOCTOR, and then spray the bottom with a good guality automotive spray undercoating, that will provide a sealed bottom, and the spray will get into every nick and craney.
