Found the name of the stuff jobt, you should love me
"felpro karropak .030"
I think they have other thicknesses besides .030.....
but that is what came up when I checked my internet history!
As for cutting base gaskets.
Use a good existing gasket, trace it onto paperboard ( cereal box ) and then you have a template. somebody sent me a bunch of paperboard templates for my hobbit so all I got to do is trace and cut <3