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What material(s) I can use to make this kind "hard" waterproof board at home?

Deviating from previous suggestions into one that would require some extra legwork, but would avoid risk of fumes or burn injuries/damage, I'd suggest closed-cell PVC foamboard, frequently known by ...
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2 votes

What material(s) I can use to make this kind "hard" waterproof board at home?

One thing you may be able to readily find, or salvage, is corrugated plastic board (looks like corrugated cardboard, but made from plastic sheet instead of paper). It's commonly used for things like ...
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What material(s) I can use to make this kind "hard" waterproof board at home?

I've often seen on a couple of YouTube channels the practice of recycling plastic bottles by melting and applying pressure in a form. It's HDPE and carries a number two recycle symbol. One useful ...
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