If you thin with mineral spirits, you may dissolve the primer. Check your primer by spraying a test piece with the primer, letting it dry for a couple days, and then try to wipe if off with a rag soaked in mineral spirits. If it wipes off...don't thin with mineral spirits. I found this out the hard way once when I was wiping dust off of my parts with a mineral-spirits-soaked rag before spraying the topcoat.
If you are using the Valspar hardener, read the can and follow the directions, as I believe you have to mix the hardener, thinner, and paint, and then let them sit for 30 minutes before spraying.
I also agree with everything NealC said...I have done it both ways, and the cheap auto paint has much less guesswork.
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