100Pcs Square Sublimation White Blanks Ceramic Coasters

For the most part they are good; however I have noticed that sometimes the sublimation paper pulls off whatever coating is on the coasters. Therefore, tearing off the print and leaving it look as though there is a chip in the coaster. It has wasted more than I care for and I'm out the money I paid for them. I tested different times and temps to keep it from happening but I keep having the same issue on some of them.