Waterproofing cardboard?

[nsdragons]

Hi its my first post!

Anyway, I'm currently in the process of making my dwarf ham a house out of cardboard (the thick kind you'd find in mailer boxes). She doesn't have much problem with cardboard and doesn't chew on it much.
I'd like to waterproof the cardboard but I have no idea what product to use, atleast waterproof it enough so that if she decides to forget all of her potty training the house wouldn't smell to bad and I can wipe it clean. I heard people paint their wooden wheels and toys to hamster-proof it, would that stuff work, and what is it in the states?

Thanks!

[thelittleteacup]

by house do you just mean to sleep in or a whole cage?

there is a thing called Plastic-Cote that would work its a spray on paint.

[KatiePillow]

Technically any non-toxic childproof and waterproof paint or varnish would be ok, but I don't know if they'd warp the cardboard..
Plastikote says 'perfect for cardboard' on it, so that should be ok, but I don't know if you get it in the US