So I obtained a free Seal press by a bit of good luck (which means I will soon have a piano fall on my head to even out the cosmic karmic forces)
It has the neoprene rubber bit that goes inside between the plates. Usually, there's some sort of board or paper material that goes in there between the plates too -- but I'm not quite sure what it is. Anyone?
I use two sheets of 2ply mat board in there. However, Light Impressions Online has a waxy paper that is made to go inside dry mount presses, so if dry mount tissue touches it...it wont stick to it.
Personally, I think a few sheet of matboard work perfect. One for top, one for bottom.