There is Carbon based paint which is fine if you use two coats, you can use a hair dryer between coats
Copper tape which isnt easy to get unless you buy bulk works fine if you are not trying to make money doing it.
I get a copper based water paint from Spraylat which works great and is the same as a copper tape but is painted on.
Gotta buy 1 gall min and it isnt cheap
You might be able to get nickel print from an electronics store but it is solvent based so dont get any on the paint or you'll be sorry.
You wont find any of this in Lowes or Hardware stores, best bet is stew-mac.com if you are a DIY