Overspray Dulled Finish??

Last weekend I painted the engine/front end/ trans of my 51 Cub, and yesterday I went back and sprayed a bunch of other parts (MTK) in the same work area (garage). I didn't cover up the what I had previously painted because I wanted to touch up a few spots there also. Now, while I don't see any rough overspray particulates or dust on the older work, I also don't see quite as shiny and liquidy a surface that was there before. I assume the problem is over spray in the air, even though I was using a HVLP gun.

Is that the problem? Fortunately I haven't painted the hood and fenders yet, and while a little loss of shine on the engine isn't the end of the world, I would like to get the liquid look back on the front end particularly. Should I just Scotchbrite it a bit and repaint that area, or compound it, or buff it, or what? I'd appreciate your suggestions. Guess next time I should cover the older paint when I'm spraying.

I'll get it right one of these days . . .

I try to replace bolts with the yellow zinc for grade 5 or 8 or stainless steel where ever a grade 2 bolt will do and leave them natural as a personal preference. When i do paint bolt heads, i use a sheet of card board and punch holes in it. That protects the threads from paint, then i spray them from one direction then bend the card board or turn it to catch the other side as needed. Their are bolt protector socket liners out there, but i use Rod's touch up artist brush method when needed or a foam brush and some times paper matches in a pinch after bolt tightening.