Letter Re: House Window Blackout Materials

I heard you in your recent interview on the SGT Report podcast talking about [the need for] interior blackout material [to stop light from escaping windows when the power grid is down.]    What is the name of the material and tape and where can I purchase it? Thanks, Paul Z.

JWR Replies:

You will find the information you need in these archived discussions in SurvivalBlog. Also see this theatrical supply company, and specifically this blackout fabric and this blackout tape.