The wax can still easily be melted as the plastic can easily withstand
temperatures greater than that needed for wax to melt.  I would simply
but the frame in boiling water until the wax melts then remove the frame.
the wax floating on top of the water will recoat the frame, which is generally
what you want anyways.

The only real trick is getting a container big enough to hold a couple frames
at a time.

-Tim