Also, by the handle, rather than a solid line, the black has faded out to a brown.
Right round the mug are streaks from top to bottom, stemming from the streaks you can see clearly at the bottom. This doesn't show very well in pic.
Yes, stuck with heat tape. I thought it may be pressure, but I thought it was already quite a lot of pressure. Will try another now, and this time with a gap at top and bottom.
edit:
OK, before anyone comments on it, yes I do have a typo - Stong, rather than Strong. But hey, I'm just testing the kit and not concentrating on the design
Reduce your artwork by about 10mm, top and bottom, and stay away from the handle - some presses just won't do full wraps. If your mugs are cold, or cool, warm them with a heater before pressing.