I've used both the Nelson primer, and the Rustoleum Automotive primer.

The rustoleum is much easier to use, and also quite a bit cheaper. Test it on a trial piece, and I'm sure it will work for you.

I use the Nelson paints in an Automotive HVLP detail gun which works pretty good. The trick is learning how much pressure to use, and how much to thin the paint.

Also, Nelson paints don't cover all that great, and need a few very light coats. If you try to put too much on at one time, it will run. It does dry quickly, so you can put a light coat down about every 10 minutes. AFter the 3rd coat its time to clean the gun.