The Majik stuff from TSC? Thin it out. I sprayed some of their enamel pretty well with a cup gun a few weeks ago.
Try adding some reducer, make sure it's mixed up longer than you think it needs to be, and fill your gun using a cone filter to make sure the chunks are out.
I haven't used Majik's primer, but i had issues sanding eastwood epoxy primer dry with too high a grit. I sanded up to I think 100 grit dry before top-coating, anything more than that would clog quick
I ended up buying a harbor freight 6 DA with some 120 grit paper and powered thru. I am not sure this tractor supply paint is worth it. Next time I will try Benjamin Moore or something along those lines. But the bandsaw is done.
I used TSC paints and primers to redo my grandfathers 9n. I used a cheap harbor freight hvlp gun and a 1.4 tip. I had no issues with clumps.
I’m no expert, but I’d suggest thinning, smaller tip, and filtering a couple of times before loading the gun