Good Evening PKM,
Release paper is a virtual necessity. For small prints, you can use the backing material from address label sheets such as Avery. A flat, heavy weight can also come in handy to keep mounted material flat. For mounting RC prints, some Seal test strips help with temperature adjustment, although small snippets of RC material can also be used; just keep the temperature hot enough to do the job without causing damage (easy to see) to the material.