Why do white spots appear on a sublimation print?

You can see white spots when something is blocking color which need to be apply to the surface. Usually, cause of that problem is dust.

How to prevent the occurrence of white dots on sublimation print? Simply use these safety precautions:

Maintenance your work space, try to always be neat, without dust. Do not remove the protective film from product until you are ready for sublimation. Before sublimation process, clean sublimation product and transfer paper with soft, clean cloth. Use compressed and canned air with which you will blow away the rest of dust from product and transfer paper. After heating process, look at the used transfer paper so you could establish sublimation errors. White dots or non-sublimated color on product will be visible on transfer paper.