Hello all. Anyone use sublimania raw back coasters? We are having an issue with tape marks on the back so probably something we might be doing wrong.

We print thousands successfully onto the sublimania cork back coasters without any tape marks (leave over night before peeling) nor any issues with Unisub raw back.

We use brown 20mm heat tape (not cheap stuff) and press at 180c for 80s.

The print is perfect but whether we peel straight away or leave it is pulling the backing off.

Not having any luck talking with supplier about issue sadly so anyone on here use them and can offer advice (e.g. different heat tape)?