Quote:
Originally Posted by markpj23
...umm... I confess I just replaced a plywood battery shelf with pressure-treated ply and I used that gray porch paint from Lowes....
Looks great on a non-essential piece of ply below the sole..
guess I'm destined for the Previous Owner thread... 
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Pressure-Treated & painted plywood
should be just fine, in a non-critical application, as long as the edges aren't exposed to standing (or very frequent splashing)
water.
For "extra" longevity, I'd have epoxy-sealed the plywood (double-coat edges), prior to painting.
Of course, should a hundred pounds (whatever) of battery get “loose”, this application will suddenly go “critical”.