Josh,
For sure use epoxy and not glue (The purple stuff is the best IMHO)
Depending on how much weight needs to be held, I used from 1 to 3 layers. You really have to take your time with it. Are you able to keep the rock out of the tank while you do this? It's MUCH easier.
Depending on where the epoxy is (Visibility wise) after it is complete, you can either cover it up with some crushed coral and super glue, or wait for Coraline or some coral to cover it. I did a bit of both.
You should swing by sometime and see my rock to get an idea what it will look like. Perhaps ill post a few shots tonight. I am no expert by any means but at least you can see the completed product.
For all of my rock, I went through about 10 boxes of putty, but I wanted the pieces I sculpted together SOLID like it was a single rock.
Keith
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