When I use my dry hot press, I sandwich prints and backer boards in between two sheets of mat boards for protection and a release paper for non-stick. These boards and release paper are re-used.
Apparently, when I was drying 8x10 double thickness FB paper, it made an impression on the mat board. When the same mat board was subsequently used to mount a print onto a backer board, it made an impression on the backer board.
How do I prevent this? Is the platen pressure too high? Is there a process to un-dent (is that a word??) release papers and mat boards used in pressing? It will get expensive if I have to use new boards each time.