Has anyone tried this? Take an empty cart put some type of lubricant inside not sure what. Inject it with the Fire Stop Silicone then take a stirring straw lube the outside and stick it in the middle. Let that setup till the silcone has set and somehow pull the whole chunk out and slide the straw out. Then you should be able to slice the chunk into perfectly fitted gaskets for a ZFM. I curious what other people think of this and what problems I might run into trying this before I throw down 15 bucks at lowes for a tube of the stuff.