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I couldn't make this up. It's Wi-Fi blocking paint additive! Just mix with your favorite latex paint and treat wall surfaces accordingly!
Not only that, but stain resistant too!
Product's Home Page [forcefieldwireless.com]
I wish I was the one who had invented and patented it. Someone's going to have a Niche Market Christmas and an IPO NEW Year.
It doesn't have to work 100%. Shoot, it doesn't even have to work 20%. Just make them think it works. Average home wireless user would just buy, mix, and paint without asking too many questions.
But good questions about doors. I would guess the additive is only claims to knock down the waves and not completely block them. How would you know? Get all "Turn Up The Volume" and drive around in your jeep triangulating your neighborhood? Hmmmm.... :)
You could always make it yourself :) here is the recipe [patft.uspto.gov].