as with all things sold for crafting, there are different grades of teflon pressing sheets. WAIT..that is the first clue..it must be a TEFLON pressing sheet. There are others out there, but they are not the quality you need/want if you are going to tackle a lot of fusible applique.
Secondly, there are different grades/types of fusible products. Not all are the same. Some will stick to air...some won't stick to anything but the pressing sheet...
point is..use what you have, but list the product by name. You can not lump all pressing sheets, not all fusible products into ONE comment! That would be racist..hehehehhe