I see waxed plaster walls in interior design magazines quite a lot, and
I've seen them at some very nice modern hotels as well. They look like
really smooth granite almost. I'm thinking of trying this in a guest
bathroom we're building at home, on walls that aren't in direct contact
with water.

If anyone's done this, I'd love to hear about the challenges and any
tips. And if there's a book that covers the subject, I'd appreciate
any pointers.

Thanks!