Print your design using a sublimation printer. Don't forget to mirror the image. If you don't the image will be backward.
Trim the left and right sides of your design. You want to get rid of the white edge.
Clean of any fingerprints, dust, and debris. You can use alcohol to wipe off fingerprints and a lint roller for dust.
Wrap the design tightly around the tumbler. Make sure everything is tight and secure to the tumbler to avoid ghositing.
Put the tumbler in your Air Fryer, Convection oven, or mug/tumbler press to activate the ink.
Allow your glow-in-the-dark tumbler to cool completely before removing the transfer tape.
Check out the video for the full tutorial. Learn how to make a glow in the dark tumbler in the Air Fryer.