Tried a mini batch of 4 and learned to thin the oil-based enamel down around 50/50 with acetone, so it spreads out thin on the water, then kinda sucks back together in a 4-6" round, floating skin. Sorry no pics of that, I was workin kinda fast...
Had some fun with air bubbles but I just poked at 'em while still wet. Let them dry for 24 hours or so and lightly rubbed with fine steel wool (0000) until the bumps were gone.
Started cresting and will finish that tonight while trying to figure out what finish to use...
It's really pretty easy and they turn out lookin' sweet!