Originally Posted by WolfWhistle
Pretty much... the shiny stuff is silver Mylar plastic. Some light gets through... maybe 10%. Its the stuff many windshield sun shields are made of.
I have used it for years in the California heat.....no issues so far.
To prevent light from coming through, I laminate one side with aluminum foil.
Just spray both parts with 3M 77 and stick 'em together.