reflextics - well the shiny bubble wrap type stuff

[Snikwahjm]

That’s the tape I used! Yes, shiny side out pretty side in. Yes the van windows are tinted - with what? Who knows?
Sssooooo if I want some heat maybe move the reflextics away from the window and let it heat up a bit? Reverse the shades?
I had some Mylar from the trash - laid it over the window outside and traced to make a template. That worked beautifully.
We had to put screws with washers on the side of the window to get the magnets to stick.