using posterboard as rear skirt template

[JimWoo50]

I've got the gap between the canopy and fuse all taped up and ready to glass but after an initial test run using wax paper as a barrier between the two I've decided to try something else less prone to creases and bubbles. I would appreciate any suggestions as to what I could coat the posterboard with to prevent the epoxy from sticking to it. Thanks. Jim.