The MSDS link did not work for me.
It may very well be toxic. That's what I was scared of before I did it.
I read some posts of others doing it will no ill effects, so finally tried it.
I don't know if it's potable after curing or not.
Again, no problems so far. It may be leeching bad stuff into the water for all I know, but my tests don't show anything abnormal, and my fish are as happy and healthy as ever.
As another option, you might look at irrigation piping at Lowes / Home depot.
I think most of that stuff threads together and is either black or dark gray.
Probably more expensive than PVC, but maybe worth it in the long run.
As for "Make it Stone" I'll have to wait for someone else to try it. The Fusion was hard enough for me to try. I'm not really the guinea pig type.