Just a simple question...

I've got copper head gaskets on my o-ringed 357 and I have a small oil leak coming from the deck/head area. I'm assuming the copper gasket has developed a leak. I was told I could reuse these copper units, but I'd like to verify that here. Also, when I reassemble, should I use any sort of coating (copper coat or otherwise) on the surface of the gasket?

thanks all