Nice work on the plastics. Did you put them between 2 sheets of thick glass?? .. or some other method?? I need to flatten a set too and could do with a few hints.
Gday Mark .
I put them on a sheet of grease proof paper on a pizza tray then when I took them out had them between 2 sheets of greasproof paper witha couple of heavy books on top while they cooled down (5 mins or so).
I watched them like a hawk while they were in the oven