After you heat press an applique to a garment, how long should you wait before peeling the carrier or the hot mask from the applique? A number of variables come into play. The answer depends in part on the physical properties of the hot melt adhesive and the type of carrier used on the heat transfer...
http://supply55.com/blog/2014/02/heat-transfer-films-hot-warm-or-cold-peel/
