Hi y'all. I've been building my WTF's new viv and I have now come to the waterfall feature. I have used expanding foam to make the waterfall shape and now I want to use a cement type product to cover it with. I've seen this done in vivs on google images and I it looks really good.
I'm sure normal building cement contains lime, which is obviously no good.
Does anyone know anything about the safe stuff which they are using in these setups?