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Default wax and fiberglass/polyester resin

I notice on the bottle of polyester resin I got that it says not to mix
the stuff in a waxed paper cup. It's in bold too, so it seems
important. Not only was that how I was going to mix it, but I was going
to lay the material on some wax paper so it won't get glued to the
floor. I have used 2 part epoxy in this fashion and it has worked well
(the epoxy cures and was too flexible, so I'm using polyester.). Does
wax react poorly with polyester resin?