Especially thin cardboard?
i've used wheat paste to glue together cardboard and make a 3D shape for a cat to scratch on. The 50 layers of cardboard made it kind of stiff and hard, but from what I remember of your other question, this wouldn't really apply to your problem
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really stiff NO . + being water based it will make the cardboard soggy.until dry.
You already have the best answers, polyester resin would be the way to go.
Not really hard, like resin hard.
And its susceptible to mould,being great mould food