Pretreat each side. For dark garments with white ink you will spray them down, roll the fibers flat and press them for 45 seconds. Then after printing you have a 3 minute heat press time. If you have many heat presses the process can go quickly. But never as fast as screen printing. For white garments they make a pretreat. It is great and makes the print much more vibrant. It is just a very slow process compared to screen printing. It is great for people who want low runs. But who just wants to do 12 shirts? I have had times where I took on an order for 500 shirts and was printing for days and nights until the sun came up to fulfill the order. In my opinion, dtg is great for a shop that already has screen printing, but would like to add the option of just getting 1 - 12 shirts at a higher rate.