Sometimes some sculpty don't rez correctly.
You think the problem is sculpty but the problem is often your settings ;)
Here's a tip for better rez Sculpty.
1. Show the "Advanced" menu by press Ctrl-Alt-D, or Opt-Ctrl-D on a Mac.
2. Go to menu Advanced -> "debug settings" .
3. In the blank space, copy and paste the word "RenderVolumeLODFactor".
4.Set the value of "RenderVolumeLODFactor" to 4 or better.
Changing this number WILL make ALL sculpties look better.
Enjoy <3