Likely 90% of those posting around here know paint better than I, but I have had that exact symptom with two different problems (though slightly different in look).
1. I didn't sweep the floor or curtain off the rest of the garage and didn't realize until nearly done: I was kicking dust into the air - I actually managed to get some large chuncks in that as well.
2. I'm not sure if thinner itself is the cause so much as the gun or perhaps way too fast of a thinner, but I've had paint "act like" it was partially atomizing in the air and hitting the surface part wet/part dry and leaving a grainy surface (again I didn't notice it right away, though I believe I caught that while it was wet). I believe I kept it about the same viscosity [assuming you're not too thick and starving your gun...done that too :oops: ] and opened the paint needle knob a bit further.
In the former, I think I lightly sanded and didn't see bare spots crop up so I just shot the top coat... did that one for a neighbor who later sold it, so no idea how it held up, but looked fine.
The latter was a horse trailer not a tractor and a "impact resistant" industrial coating [urethane, I believe] with a catylist rather than enamal; IIRC I had planned two coats of primer anyway, so a little sanding, second primer coat, came out fine, still holding up great. This was a "heavy" primer though and not intended for much reduction; infact I believe I had to to remove the cup screen too.
Of course the latter was probably 3 years ago, the former more than 10, so a bit rusty in the head if not the paint jobs......... let's see what the experts say!
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