That's because Polyester (AKA PET) is thermoplastic and usually applied as powder (powder-coating). PET can be dissolved and sprayed, but the coating is unlikely to work well for sublimation.
Powder-coating powders used in sublimation coatings contain modifiers to increase temperature resistance, and have to be heat cured at higher temperatures than pure PET. Polyester is not the only possibility obviously, but the heat curing thing applies to all thermoplastics used for sublimation.
Similarly... plastisol Inks and PVC pipes are both PVC based, but the additives make them very different.
Now... is there a way to make your own blanks? Sure there is... but coating suppliers are not interested in people who want to buy small quantities. If you have a factory producing ceramic mugs however, their sales people will come to you.
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