Agreed on the URETHANE clear on top of the epoxy OR flow coat polyester resin... That is the normal practice for UV protection... I have consulted with the wizards on this topic numerous times for wood deck conversions/floors/all wood boats/etc...
Any quality Urethane clear will do... I personally use the PPG line, they do have a value (economy line) that I have had good luck with. My last paint job on my 5.0 fox body was cleared with the value line from PPG and it looks amazing after quite a few years of full sun/weather/winter and no special wax/treatment...
As for the oil mist from the salamander heater, I never did hear of this happening before BUT it makes perfect sense, its basically a huge paint gun misting out atomized oil....... Sorry you had to find that out the hard way... :(
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