After the first layer dried for about an hour, I threw on another coat, then one more after that.  So I stopped at three, but four may not be a bad idea.
Well, this is pretty much the finished product.  As you can see, I still have some more work to do though.  What I like about this is I can throw just about whatever I want back there, and then just sweep out the mud, etc.  Anyhow, good luck if you try this and if you have any questions email me @ [email protected]
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