I am not a master of glassing EPO foam, but I would use 3/4 ounce fiberglass cloth and finsihing epoxy to do the job if you plan to fly it. That will keep the weight down.
Finishing epoxy. Made for glassing and smooth finish rather than as a strong adheasive.
If you don't plan to fly it, then use 2 oz cloth to make it more rigid for use as a plug. Weight won't be a factor here.
I get my glass here...
...and epoxy resin here...
I've had good luck with the MAS resin and slow hardener. Very thin, long pot life, applies easily with a brush or foam trim roller. The foam roller works better than a brush for wetting out cloth to a consistant saturation and minimizes the need to blot up excess resin.
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