Greetings, I am VERY NEW at the heat transfer thing...I basically got a free heat press for our church's youth group and make T-Shirts every now and then for them. The darks seem to be fine, but the lights seem to "stick." I've tried a variation from 335 degrees to 350 degrees, and from 8 seconds to 12 seconds, and it seems like I still have the problem. The first time I had this problem the image looked very very good as I was removing the transfer; but one small part wouldn't peel off. I don't have much experience with this and I'm fairly new here, I would appreciate any advice. Meanwhile I'll keep experimenting...thank you very much!