Believe what you want, but it's strange that nobody believes me until they try my shielding : dead silent and you can let go of the hands of the strings, there's no buzz and no feedback buzz when touching them again...
I explained my process to a desperate luthier upon recommendations of a mutual friend, and he called me an hour later, he was so excited that he said it was almost magical: absolutely no noise on a hollow body guitar with single coils that was a nightmare, and which his owner is now using widely on stage and in the studio without fearing anything buzzing.
I really think telling people how to solve their problems easily is a complete waste of time: they need non working complex solutions...
The infamous "You know, it's not that easy" is something I can't stand anymore.