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Old 08-21-2012
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Re: plywood type for fiberglass .

you would be better to use a piece of hardwood (oak/hickory/etc) and epoxy coat that....

you can then see what is happening to the wood....

Plywood is going to "squish" over time unless you are using multiply/specialty ply...

the home stores carry 4,5, or 7 layer, up to 3/4"....but that is poor for your purpose from the get go.
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