Review on 42 Pack of 4 Inch Round Sublimation Blank Coasters - Circle Sublimation Blank Cup Mat for Heat Press Cup Coaster Blank, with Rubber Coaster for Heat Transfer by Jennifer Roberts

I ordered these sublimation coasters Coasters for my upcoming supplier shows. Unfortunately, they do not sublimate. I've tried many coasters in the pack and different temperatures and times with my heat press and couldn't get even a bit of color on the coaster. Unfortunately I only tried sublimating a few weeks after receiving the package and can't return it so I'll try putting heat transfer vinyl on it and pray it will hold up.