Charley Hutton uses 3/4-inch supply lines through most of his shop but that’s only the start. Eastwood recommends the shortest length of at least 3/8-inch-diameter hose and advises eliminating as many fittings and elbows as possible.
 Hutton repeatedly emphasized the importance of a high-quality water/oil separator. Good ones aren’t cheap but neither is a modern finish that blows up in blisters or fisheyes.
 You may not be able to feel the difference between 400- and 600- grit paper but a painted surface can … and it will show you. Hutton advises prepping surfaces for solvent-based paint with the former and surfaces for waterborne with at least the latter.
 We’ve all done this before, some of us many times. With the spout at the bottom a full can will pour when the spout is still pointed up. Fluids splash upward rather than flow sideways.
 Rolling the can over on its side and orienting the spout toward the top causes its contents to flow freely away from the can. Try it; it’s awesome.
 Waterborne prep requires a solvent and water cleaning process. Hutton recommends finishing with the solvent-based cleaner to displace water.
 Water won’t attack most high-quality paint guns but the elements suspended in it can leave deposits. If shooting waterborne do yourself a favor and follow the water-based cleaning process with one using a volatile solvent-like lacquer thinner or acetone.
 Hutton says the solution to cure a tack cloth from leaving a trail of its own contaminants is simple: unfurl the new cloth, shake it out, refold it, and continue. More than eliminate the potentially flaky residue, the refolded cloth will often better conform to complex shapes.
 Note the spraying distance Hutton achieves here. What’s more, he has the gun pointed directly at the panel for the best transfer rate. This is good.
 This is not good. Note how the spraying distance increases if Hutton swings the gun at an arc. The increased angle will further reduce the transfer efficiency. The pattern will be dense across the middle and thin at the sides.
 Note how Hutton extends his arm to move the gun down the panel. Also note how he compensates for his arm movement by bending his wrist.
 Hutton completely changes his wrist angle as he moves the gun down the other end of the panel. Note that the shooting distance and angle remains consistent regardless of the gun’s position. That will ensure a consistent pattern along the length of a panel.
 A panel may look shiny when viewed head-on but it won’t tell you squat about the surface condition.
 However, note how much the panel reveals when viewed at an oblique angle. Everything from the yonder wall reflects in the surface and contrary to what Mom said it’s really what’s on the surface that counts. Hutton says shooting this way will improve your results dramatically.
 A mechanical bond doesn’t require very much—in fact too much of a good thing can harm a recently applied finish. Hutton maintains that an extra-fine gray abrasive pad creates a sufficient opportunity for a mechanical bond.
 One of the most reliable sources for dry-sanding papers is for dual-action sanders. They rely on dry lubricants to prevent paper clogs, a real benefit when sanding partially cured finishes.