I sprayed in a U-Pol Raptor Bedliner...
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I used a black 8-bottle kit with included spray gun from amazon ($177), and a $5 in-line regulator from harbor freight (links below). I used my little 15 gal. portable compressor (4.8 CFM @90 psi). Little compressor kept up like a trooper, but I don't think I'd want to use anything smaller. I used just 40 psi at the gun to get a more grippy texture (more psi=finer texture). I used all 8 bottles to get 3 good coats on my 9' bed and tailgate.
A few tips;
Prep is everything... The entire area to be sprayed was washed down with naphtha, and wiped dry
before masking and sanding, and washed/wiped again before applying the liner. Wear a good respirator, remember it's CARC we're sanding here. I used a 4" angle grinder with a flap-disc for the deep paint gouges and rusty spots, a 5" DA with 100 grit discs to scuff up the big areas, and 150 grit paper to get into the little spots and up to the mask lines. I masked the tie-down ports with 1/8" insulation foam that I cut into 4" circles, and popped them into the ports. Everything else I masked with automotive mask tape, paper, and plastic drop cloths.
Have a couple quarts of lacquer thinner, a metal or polyethylene basin, brushes, and a catch can at the ready so you can clean the gun in between bottles. Otherwise the product will build up and restrict the spray gun pick-up and nozzle tubes.
Per U-Pol's website, you'll want to keep the freshly applied liner from getting wet for 72 hours after application... plan accordingly.
The way this stuff sticks to bare skin is no joke... wear good nitrile gloves, and if you get any on your hide, get it off before it sets up (otherwise it may be a part of you for many days or even weeks... no, I'm not kidding!)
Raptor liner;
https://www.amazon.com/U-POL-Raptor-Urethane-Spray-Liters/dp/B01CKE7E9S/ref=sr_1_5?s=automotive&ie=UTF8&qid=1538936337&sr=1-5&keywords=raptor+liner
Regulator;
https://www.harborfreight.com/150-psi-air-compressor-regulator-kit-with-dial-gauge-68223.html
Plastic drop cloths;
https://www.homedepot.com/p/HDX-9-ft-x-12-ft-0-7-mil-Drop-Cloth-6-Pack-DCHD-07-6/204711647