I believe that acidity is the main problem with this kind of rock..So I would get it in water a few days after it has set up.Then test the Ph daily...Also,I never heard of curing it in the toilet.Seems that would #1,be too cold.#2,not salt water,And would ultimatly not"cure" the rock at all.....Unless I'm missing something,it seems a total waste of time too me...I would just put it in a big bucket and cure it as regular rock...