That's an idea, for sure. I actually believe I have a can of that, or a similar product around here somewheres. The PVC is excellent at creating and storing static. I cut up my PVC tubing on the chop saw, and the chips/dust happened to blow back all over me. It's was all but impossible to get it all off of me due to static cling.
However, lots of people make BP in PVC jars with no problems. It's me introducing a solid electrical contact/discharge point in the form of a bolt in the middle of the end cap that has me worried. It's an unknown factor. Could be nothing; could be a big Kaboom with dozens of pieces of copper clad lead flying about.
I don't think I'm going to use that cap. It would be a small convenience exposing a potentially huge risk...
Vettepilot