These are the other possible causes as to why you will have a peeling problem.
Heat transfer vinyl coming off.
Maybe you thought that it adhered properly but after a few washes you noticed the heat transfer vinyl peeling off.
For heat transfer vinyl to work correctly it must be melted into the fabric.
Your vinyl isn t coming off of the transfer tape.
After removing the plastic carrier sheet i like to flip my project upside down or inside out and apply some more heat to the backside to ensure a really good application.
It is likely that your heat transfer vinyl is peeling off due to the temperature of your heat press.
Some types of heat transfer vinyl are cold peel which means you must allow the vinyl to cool completely before removing the clear plastic sheet.
I would like to add that you can effectively use a vinyl letter removing solvent in case you want to remove the vinyl from your garment.
You are trying to apply your decal to your favorite water bottle and after rubbing it down on your cup for 5 minutes the vinyl will not come off the transfer tape and release onto the cup.