I've tried with and without Insulbrite, anywhere from 1 to 3 layers of batting. My favorite is 1 layer Insulbrite and 1 layer cotton batting.
Honestly I can't tell, once the potholder is made, which side is the "shiny" side of the Insulbrite. I don't mark them in any way so I can't keep track, and they work just as well one way as they do the other so I don't worry about it. I figure if I can't tell...it must not really matter!
Anybody else who makes potholders w/Insulbrite - can you tell which "way" they go once they're made?