FWIW, I have decided not to reuse the Mr. G MLS head gaskets. I have a few sets of the old DG composition "race" gaskets that never caused me any problems, other than being a PITA to clean up after disassembly.

I'm on the 3rd time around on mine. BB, 15-1,-1 heads. Split them up, clean, copper coat and go.
Doug

When people spray coat them is it only on the surfaces facing the block and heads? Or does each layer get coated?

I personally did them all.
Doug

Guys
Coppercoat was made way back in the day as yes--a sort of sealer with the copper added to promote heat transfer with Steel Shim head gaskets
It is not the right product for the way you all seem to use it
The spray can Hylomar is the best head gasket sauce in the world--I have re-sprayed Cometics three/ four times and kept on using them--it restores the ability to seal the water--that is all it does
The Mr gasket multi layers suck!! Use Cometics or else
And if you do use steel shim gaskets the Hylomar is ten times better than CopperCoat--why don't you just use some Indian gasket sealer while you are at it

I had to drill out one rivet on my small block x heads 360 block, the rivet got pinched between the head and block. Cometic gaskets. Caught it just as I was about to torque ut down!