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Hi. First thing you need to do, is a nozzle check on your printer, to make sure all the nozzles are firing up ok. Sublimation inks can clog more often then regular inkjet inks.

The UK market is currently flooded with cheap sublimation mugs coming from China. Some are actually very good, but many have an indifferent quality, when it comes to the sublimation coating on the outside of the mug. Without a good receptive surface, you will strugggle to consistently get quality images onto your mugs. It is the coating on the mugs that 'draws in' the ink from the transfer paper and gives you the final result.

Edges crumbling are usually the result of damage in transit. Surfaces blistering would indicate a poor quality mug that has been incorrectly coated and with very little quality control taking place, once it has left the kiln. If you have more than one mug like this in the box, I'd avoid using your current supplier again.
 

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Hi. Your problems are down to one of three variables being wrong.

Insufficent pressure: Insufficient temperature: Defective mug coating.

As JB suggested, it is important to carefully wipe the mugs before attaching the transfer paper. The pressure adjustment can work loose, so you need to ensure that the mugs are firmly gripped and you cannot turn them when locked in the press. The ink is peeling off as it is simply resting on the surface of the mug, rather than being absorbed into the coating. Try adding another 20 seconds onto your timings and see if that has any effect.
 
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