neil_w, thanks for the tip!

tbzep, good to know--we don't currently have and old casings, but we'll watch for some

ghrocketman, It does seem that a lot of people use PVC cases. There are also other non-PVC plasic options, but I don't know if they are any better. PVC can itself be a fuel, so it also makes some sense. I'm having a hard time finding safety infor on zinc/sulfur fuels. Any pointers?

tmacklin, I was wondering abount doing that, and of even wrapping our own paperboard with glue. we'll look for West Systems epoxy, too.