Rachel it has to be completely cool before you peel it off..also don't leave the iron on too long or it will melt it too much...depends on what you are doing with it. BUT when I make my sunbonnet sues to applique I find that using the fusible interfacing works much better. Then I just iron it onto the backing block and hand stitch around the edges. You have to make sure you put the sticky side towards the fabric then when you flip it the sticky side its outwards. Hope that didn't confuse you...happy stitchin' crafty_linda_b