Hey all, well i've been working on a cage with fake rock for the back wall. I covered the wall with styrofoam, and then covered the styro in sanded grout. I put a couple coats of grout on, and then put a grout sealant on thats supposed to keep it from cracking. My question is does this sound right, or am i giving myself alot of extra work? I appreciate any advice, thank you.

