copper grease an cost effective way of screening from r f pollution?

hi has anybody out there discovered the benefits of copper grease as an effective way of screening out rf pollution it is very effective and not to expensive happy tweaking

It is about as effective at that bomb proof grease for protecting against a direct hit from an atomic bomb.

Thanks for the input: at some point in the not to distant future I plan to build an electric guitar and this sounds like an excellent substitute instead of lining the wiring cavity with sheet copper or brass.