I'm not sure they're made out of the same fabric. Although they are shiny and reflect like and sunlight. That is somewhat different that the fabric used in the potholder padding.
I might suggest trying it with a test sample. But the cost of the insul-bright padding doesn't compare to having fingers and hands burned with something hot.
Is there product or company information on the shades that you could contact them or their website?
I'll be watching this thread as well.
Pam M