Don't sweat it, it'll just take a look at the product lines, maybe an email to the company. It should be easy with the specifications you gave me. I think...I'm no paint expert lol. This is really helpful, since ive been wondering what kind of paint to use for this. I wonder if I could use it to coat fake logs made of PVC Pipe. The pumice may have sounded interesting, but it's no big deal.
Also, I'd love to see pictures of your vivarium! The background sounds cool.