The most likely problem is the UV map.
Chris, you say
only half of my prim appears the other half is transparent!
The phrase "the other half is transparent" suggests that maybe the surface normals on half of the object have been reversed. If so, people often describe this condition by saying that the sculptie is "inside out". The half that is transparent: Is it totally missing or can you see it from certain angles (like looking at it from the inside)?
Prim Composer builds the sculptmap using the UV map. If the UV map isn't correct, then you can get all kinds of anomalies, depending on what is wrong with the UV map. In many cases, the sculptmap won't generate at all, but it is also possible to get half the sculptie if half of the UV map is correct.
Because of the unique requirements of a sculptie, you cannot simply create a model and expect it to work. You have to make sure that both the geometry and the UV map of the object satisfy the requirements of being a sculptie.
This is why I usually suggest that folks start by creating a sculptie using the SculptMap or SculptShape buttons in the Prim Composer create panel. If you start from there, then you are guaranteed to have a valid UV map and geometry as a starting point. Then, if you apply modifiers and operations that only move the vertices, you will always end up with a valid sculptie.
If you create the object using different techniques, then you need to understand the technical requirements of a sculptie and you might need to modify the UV map to make it compatible.
The SculptGenMax FAQ has some examples of what a sculptie UV map should look like.
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