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I'm sure this paint would help, but Most people like having a window to the outside world. Interior industrial doors often use glass panels to make sure the path is clear before opening a door. And GHz frequency RF passes fairly easily through untreated glass.

This stuff would certainly help, but so long as I can look up from my desk and see the cell tower down the road... Or look through the glass in the door and see the hospital's antennas down the corridor...