2 part can actually be sprayed in tighter spots than a rattlecan with the right equipment, fine jet on a touchup gun works wonders.. but even a fullsize gun get's in most places... but 2 part uro primers are a minimum of about $130 a gallon kit...
that's what I run, DuPont 2k primer... my paint guy is albert kemperle on the corner of Clifton and rt 37 in toms river.. right off the highway diagonally from pep boys kinda..
https://www.google.com/maps/place/A...05,15z/data=!4m2!3m1!1s0x0:0x14801eabd0c60289
the zinc I use, and the guys in here use is rattle can, marine stuff by Moeller..
https://www.google.com/#q=moeller+zinc+chromate&tbm=shop&spd=12769559160010018231
I get it thru work for about $7 a can... but it can be had online or from a west marine and such.. it isn't as nice as a real 2 part zinc wash, but VASTLY more user-friendly, and cheaper.. you'll see it often referred to around here as Ryoken green...
if you've noticed the green primer on my tubebed build on Mutt, that's the green zinc... if you go a bit heavy with it, it'll hold up to weather without anything over it.. as a temp covering, that's what I'm doing thru the winter, till I can put uro over it in the spring when fully fabbed.. heck, Zim has been running around with his rig done in it for a few yr's now...
but it is just an etching primer that will need a primer over it on sheetmetal (hood, fender, etc) type areas... other areas like floors, parts, etc, you can topcoat right over it.. but obviously uro between is better...
you can read up on in my tech thread on it...
http://coloradok5.com/forums/showthread.php?t=262999&highlight=zinc+chromate+tech
if you need I could pick you up some cans thru work...
or.... you could just buy rattlecan or a gallon of rusto enamel primer at Ace hardware for $39..