15-10-2013, 02:12 PM
I was gonna ask this exact same question when it got nearer to the time. I was gonna ask if just sanding the surfaces nice and flat would be a solution. Splodging Firegum on seems to be a less elegant and perhaps more troublesome step than might be needed. As in the OP I can just imagine it cracking or not getting an even bead and it blowing in the thinner parts. Making your own gasket out of copper seems a bloody good idea though!