Paint runs in epoxy primer

This afternoon I sprayed it off with air and wiped it down with cleaner. I then shot it with epoxy primer MP170. Did not come out as I wished but looks OK for a first paint job.
Primed

Problems I had. While this paint gun (a craftsman conventional siphon/pressure gun) has never been hooked to a air hose before I did get it for free with my compressor and that was 25 years ago. It sprayed fair but seemed to sputter or spit the paint rather than a smooth spray. I was using it on siphon. Got the flat areas nice but in the corners where I tried to get good coverage I got some runs. Think I way go to the big orange warehouse and get another gun before I spray the color coat. If the primer runs I would hate to see the color coat with this gun.

So what do I do now. 1)Forget about the runs and just go on? This is the cast and they are not real bad.
2)Try to sand them out before putting on top coat?
3)Spray top coat then worry about sanding the runs.
4)If I sand what do I use?

I will be using MTK for the top coat and would like to spray the top coat tomorrow. And yes I got fresh air. Thanks John

THANKS every one for the help so far.
John

You should only need 1-3 coats of epoxy primer to get a nice high build.

AS far as your spray gun: Always run a little paint thinner through the gun to clean it before and after using it. Your primer might be too thick if it sputters. If it still sputters than you might not be getting enough air in the cup as the gun sucks the primer out. Clean the vent hole. You can also hold a rag over the gun tip tightly and pull the lever to force air into the cup. This will most likely clear the restriction in the vent hole for a period of time.

Apply your top coat in 2-3 coats. 15 minutes between coats.

Mike