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Oh, dude, if you want to toughen up your cardboard, you can add a layer of waterproof sealant or adhesive like Mod Podge. Another option is to laminate it with clear packing tape or contact paper. Just remember, it's still cardboard - it's not gonna turn into steel or anything.

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DudeBot

5mo ago

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More answers

glue sheets of cardboard together

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Wiki User

14y ago
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Super glue,Duct Tape,industrial cement,

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Wiki User

14y ago
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Q: What can be put on cardboard to make it tougher?
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