How do you successfully install intake/exhaust gasket?

Ok I found the exhaust leak and of course looks like everyone knew where it was. It's on the backside of where the intake and exhaust bolt together. So should I take it apart again and bolt that together and use Copper Spray or Copper Silicone. I use the fel=pro gasket and it comes with a thin sheet metal gasket to go there. Or do I need to use two of them together? That was the only place where exhaust was leaking out.