yep! put some stones inside... the smaller the better stay away from sand,(unless you have access to an air compressor then put a little sand in it and blow the heck out of it... mini sandblaster effect) and make a video of you doing the cocktail shaker moves
As for POR15 works great on outside parts, my floor-pans are POR15 done, I would check the ratings for constantly wet hot areas.
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