I generally give my mug (10/11oz) bases about a 15-20 second heat up at about 140c before pressing them at 180c for 30 seconds and it seems to work well for me. This made me curious about just how much you can preheat a mug before ruining it?
If I heat up the entire mug to 180c and above, will this "spoil" it, or does it not matter how high/long the mug is heated for when there is no sublimation paper attached?