I did several of these shirts a few years ago and let me tell you that I really needed to watch a video on how to layer HTV on dri-fit shirts. I did find out later that I needed to only press a few seconds to keep the HTV from shrinking on the polyester. Also I need to overlap the layers a bit when doing knockout to help with any gapping. I haven’t tried any since I did these but I might get a polyester shirt just to see if I can do it correctly.
Have any of you been able to perfect HTV on polyester?