I see this is an old post that didn't get any hits. Well, I'll still give my 2¢. What you could do is to find the cheese rind that you like at the store, buy a piece and blend it up with some water, and wash your cheese with it. The other is to be super patient and let nature take its course. Once the rind has properly developed, just let what grows grow and don't wash the cheese for a while.