Hello, recently, I have been machining a lot of graphite molds of a bowl like shape; what would I use to "bench" the halves together? I know with aluminum, you could use prussian blue, but I don't think that this would show up on the graphite. The pieces are of a nature that they don't slide together; they mate straight face to face. When I put the two halves together, they rock a bit. I belive that the problem lies within the model itself, and not the machining; nonetheless, I need to fix it.

Thanks in advance,
Mark Roberts