Askadi623, you will want to use a heat press that allows you to load the garment on just like the platen of the GT3 with the front (when pretreated) only getting cured. We are after keeping the front and back of the shirt separate during either of the curing operations for the garment. So for the pretreat cure we want to thread the garment and also for the ink cure we want to thread or load the garment onto the platen. Try this versus sitting the garment both front and back directly onto the platen. When a garment is not threaded on the heat press, some pretreat passes onto back layer. When ink, while still hot, makes contact with pretreat on back area some will adhere. Also ensure that the pretreat and ink are fully cured before stacking in this manner. If you’re located within the US or Canada and still require additional technical assistance, please give us a call at 877-4Brother or contact your original dealer if outside these areas.