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I fully agree with the epoxy. Great stuff. I used to use DP40 back when they had the lead in it and it was only available in gray-green. I once put two coats of that (after sandblast) on a portion of a Honda cowling that stayed outside in the NH weather all the time, not topcoated, for years with no rust showing through. The gray-green had faded some but the protection seemed as good as new. In more recent years PPG took the lead out and called it DPLF. I also have changed over to the OMNI MP170 because of cost savings. It seems to do fine but I don't know if it would compare with the old DP on long term, direct exposure. I don't think there is a better bare metal primer than epoxy - no isos, great adhesion and superb corrosion protection. I notice you are also a promoter of epoxy first and then plastic filler rather than the more usual other way around. I am too. I like to get the epoxy down just as soon as possible, especially on a sandblasted surface. I can dub around with filler here and there as needed at my leasure, as long as I get it done within the epoxy time window. It is said that the adhesion of the filler is not as good that way as if it were applied direct to metal with at least an 80 grit scratch. That may be but I have never had a problem with filler separating from the epoxy under it. Unless one is expecting it to hold up in a demolition derby, I think the adhesion of filler on top of epoxy, if done properly, is entirely adequate for all normal situations. The "hot spray" method (trick?) you talk about for alkyds has been around a long time. I seem to recall reading about it way back in the '60s regarding DuPont's Dulux. I think I would prefer to set the paint can in a container of hot water that is on the hot plate, rather than directly. That should provide a more even heating to the paint. I have never tried it and you're right, it hasn't been discussed in this forum - at least not since I've been coming here. Boy, that's some heavy equipment your guys are painting. Glad to see your part of the operation got a spot in the "virtual factory tour". Is that your feet we see? Ha, Ha, Ha. 
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