EMC-SEC Technologies, the sales and marketing arm of Unitech LLC, announced that it will begin marketing an RF reflecting paint ("Unwanted Wireless Signals Bouce Off This Paint", W. David Gardner, InformationWeek, 16 Mar 2007). The paint is used by various U.S. defense and intelligence agencies and was subjected to three years of testing.
The paint is easy to use. Simply roll , brush or spray it on the walls of a room or structure and wireless signals are reflected back. This is a valuable tool to prevent eavesdropping.
There are some disadvantages that might cause adopters of this reflective paint to use it sparingly. Anyone standing in a room with this paint on the walls and ceiling will find that their cell phones don't work.