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Hi John, Sure, you can use epoxy primer in a touchup gun. I do it all the time. Here's mine doing just that with PPG OMNI MP170:
My spot gun has one standard tip size and really is designed for topcoats but will work fine for epoxy and will even work with surfacer, although the tip is a little small for that - but it still works. If you are doing most tractor parts separately, a touchup (sometimes called a spot or a jam gun) is really quite satisfactory. In fact, if you are short on compressor capacity, a spot gun takes no more than a third to a half the quantity of air required for a full sized gun. They necessarily have a smaller fan pattern and will require more individual passes for things like fenders and hoods, but they will get the job done. I wouldn't want to tackle an entire main chassis at once with one, but if it is broken up into sections that are masked off, and done separately, a spot gun can do the job there also. I like to keep the size of the individual session to what can be covered by one coat with the capacity in the cup. That's not really necessary but I don't like to interrupt completing a coat in order to refill the gun. Mine's a DeVilbiss but I would recommend, as a beginner, you get something that is less expensive at first. Most of the name brand spot guns (DeVilbiss, Sharp, Sata, Binks, for example) are going to be in the $200 plus category, perhaps closer to $300. I'd start out with something like a Campbell-Hausfeld for $50 or less. I've seen them at Home Depot and usually the chain auto parts stores have them also. I suspect you can find an on-line source for something like that but I don't have a link. I wouldn't get hung up on HVLP. You don't really need it unless there is some local air emisson law that absolutely requires it. Gravity feed is most popular nowadays (usually HVLP) and is easier to clean but suction feed is an old standby and works well. If you start out relatively inexpensive, it's easy enough to upgrade later, if desired, as you get the hang of things.  Rod
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