The thickness of the design on a dark shirt will depend on the under base and yes it does have a feel like a heat press.We are trying to decide if we want to purchase an Anajet machine. A lot of our printing witll be done on dark colored shirts and we understand about the pretreatment process. However, we have heard that the chemicals for the pretreatment contains toxins and formaldahide. Also, that when the print is complete on a black shirt, the design feels more like a heat press. Could anyone please clarify what we have been told.