New paint blocks out cell phone signals

UPI is reporting on a new type of paint created using nano-technology that can block cell phone signals — and it can be enabled or disabled, not just always block the signals:

"You could use this in a concert hall, allowing cell phones to work
before the concert and during breaks, but shutting them down during the
performance," said Michael Riedlinger, president of NaturalNano.

Not that I understand much of this new nano stuff, but these tubes
are not the conventional carbon based nanotubes, these are made of
something called halloysite (made of aluminum, silicon, hydrogen, and
oxygen).

What I want to know now: if they can block cell signals, how long
will it be until they can block (or for that matter amplify) WIFI
signals?

You can read more about this company and what they are working on here.