Force Field Wireless has developed three products that reduces the leakage of wireless signals from a room or building adding an extra layer of security. When the DefendAir Radio Shield latex paint, which contains copper filings and an aluminum compound is spread evenly on a wall, the paint reflects signals in frequencies from 100 MHz to 5 GHz.

DefendAir is nontoxic, contains no lead, and meets all U.S. Environmental Protection Agency standards. Force Field sells 32 ounces of a copper/aluminum powder that homeowners can add to their own paint for $34. The company also makes a window film that cuts down on signal leakage: A 30-inch-by-25-foot roll is priced at $45.

The paint does have a few drawbacks, aside from blocking wireless networks, it also blocks mobile-phone signals and TV antenna signals.

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