Finishing a painting with just media

Jayhawk

Double Actioner
i should be finishing a piece this weekend - Coart on Yupo - and was wondering about giving it coat of just Comart media as an overcoat. What would that do, is there a better idea?
 
Liquitex varnish or anything else designed to seal an acrylic painting.
Granted, I Know nothing about yupo but medium is no stronger than the paint and won't really help protect it.
 
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