What foundation are you referring to when you say plastic based foundation?  Are you talking about Duragilt, or do you mean a plastic foundation like Pierco?

Perhaps a better question is, why are you trying to melt wax from plastic foundation?  You can scrape old wax off plastic frames fast and easy with a hive tool or wide putty knife.  The frames can be reused and you don't have to worry about damaging frames, hot plastic melting or offgassing more into wax, etc.

I would never recommend removing wax from Duragilt.  When the wax comes off the plastic, the only way I have found to get new comb drawn is to remove the exposed plastic with a razor knife.

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