What is safe to use???

[Keeper]

I am in the middle of making a sand dune play area that will fit in my gerbilarium. So far it is made out of cardboard, paper and hot glue (none toxic) and pva glue.
I was thinking of using some sort of plaster to coat the whole thing and make it harder for them to destroy but what is safe to use that I dont have to bake?

[Keeper]

nevermind, testing out some flour mixes that air dry and seeing if they work. Can then pva the sand on top of that if it dries so doing a test version first

[Demonic Hope]

Here you go

gerbilforum.proboards.com/thread/23305/make-sand-playground

gerbilforum.proboards.com/thread/27125/home-gerbil-den

[Keeper]

Thank you
already completed it and it is in the tank xx

[Demonic Hope]

Pics are required you know