I am making potholders with scrap fabric for Christmas presents this year (so that I can buy more fabric, I'm sure you all understand) and it's the first time I've used insulbrite. Is it better to use two thicknesses for each potholder or is one enough?

I use one layer of insulbrite & one layer of a low loft polyester batting in my potholders. I like it as it doesn't add lots of extra bulk & quilting looks great on them.

I thought you could not use polyester batting because it would melt.

Be careful using the polyester on potholders. Polyester can melt and scorch if it gets to hot. I wouldn't want to see anyone get burned! :-)

i use warm and natural with the insulbright in my potholders...i like them 'lofty' i guess :)
i put a layer of insulbrite in between 2 layers of w&n, then quilt them.

When I make my pot holders I use 2 layers of insulbright and sandwich cotton batting in between. Then I double the fabric on both sides of the pot holder. I am making pot holders to sell and I sure do not want a law suit if some one gets burned.

i just started and use a lyer, but i think i might double it up, i do strip piecing onthem

Ditto.

yes insulbrite and cotton batting!

I've noticed that the polyester filled potholders my Mom made are NOT heat resistant if they get wet.