OT (somewhat) Recommendation on an electric spray gun

Hi all

Sorry about the somewhat OT post but I would like to sample the
collective wisdom of this newsgroup members.

I am trying to find a (ideally) electric spray gun so I could
spray my car with rust protection. Since I will not use it
intensively (only once a year), I would like to avoid using
something that attaches to an air compressort (which I do NOT
have).

I have tried using a garden sprayer, but the pressure was not
strong enought to "vaporize" the oily substance: it just
squirted. A friend mentioned using a Wagner paint spray gun, but
it sprays in a rather large pattern. While this is great for
painting, or doing the underside of the car, it is not so for
applying rust proofing in remote areas of the car (I already have
holes drilled in the car by the previous owner when I got it
professionally rust proofed, so I want to use these and spray
inside the panels). I thus need a system that has a wand that
attaches to the sprayer as well. I do not know if any paint
sprayer allows that attachment. Is there?

Anyhoots. Do you have any recommendations (brand, model)?

Thanks again.