I used the 17.99 one and added a pressure regulator. They market it as an HVLP gun but I didn’t get good flow from it until I went up to 35ish PSI.
Basically, I knocked all the old clear off the bumper with 200 grit, followed by 400 grit to smooth, then I applied sealer, base, and clear. I should’ve done a layer of primer then 800 grit and I think the finish would’ve been smoother, but this is still pretty acceptable I think.
I’d probably recommend spending a little more money and getting the Astro Pneumatic off Amazon; the HF gun was fun for a first time but I don’t see it lasting through several sessions
I sourced the materials from a local paint supplier, it was pretty pricey (250ish) but most of that was for the clear, sealer, and various other hardeners/reducers… which I can use again on the next project