What's the best way to store proofgrade?

A piece of proofgrade plywood was slightly warped. All 4 corners never touched the crumb tray at any given time. It had a bit of wobble. Not sure why. Cuts are OK so far but haven’t gotten to the most wobbly parts.

What’s the best way to store proofgrade acrylic, wood & leather? Flat like a stack of computer printer paper or upright on it’s side like books in a bookcase?

Cheers!

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FLAT! With weight on it if you live in a high humidity area. (Never upright, it really warps.)

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I place the material with the crown down, and pin the edges down with these.
Wood that thin is almost never glass flat.

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What @Jules and @PrintToLaser said – and there’s more here

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