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As a general rule, you want to paint yourself out of the room. You don&#;t want to back track across areas you&#;ve already sprayed cause there&#;s a good chance you&#;ll bump into wet paint with yourself or your hose. So set up the pump on a piece of cardboard or heavy plastic (drips and spills are almost a given) in a central spot. Getting the pump primed and charged is pretty simple for latex paints. Refer to the sprayer manual for model specific instructions for attaching the gun and tips and operations but the general steps below would hold for most any sprayer.
1. Flush the pump and lines with water. Place the suction tube in a bucket of water and prime until liquid flows out of the relief tube and then switch to spray. After shooting ~1/2 gallon into the empty bucket it&#;s ready for paint. This is also a good time to charge the line at spray pressures to check for any leaks.
2. Load paint into the sprayer. Replace the water bucket with a paint can and then put the relief tube into the spare bucket. Prime just until paint flows out of the relief tube then place the relief tube into the paint can. Switch to spray with low pressure and shoot the still tipless gun into the discharge bucket until you see paint coming out. Turn off the pump and release the pressure in the line by squeezing the trigger into the discharge bucket. Now you&#;re ready to attach the tip guard and insert the spray tip.
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3. Select a spray tip based on the size of the desired spray pattern (called a fan) and coating type (latex, stain, lacquer etc). There&#;s great background info on tip selection here, but the takeaway is that the tips are really important. I use a 515 tip which produces a 10-12&#; fan for painting large areas (walls and ceilings). Then I use a 211 or 312 for mouldings which only shoot ~4&#; or ~6&#; fans. Insert selected tip into the gun.
4. Turn on the sprayer and adjust to a medium pressure and test spray onto a masked surface. Adjust the pressure just high enough that the fan pattern gives an even coverage (no lines along the edges). Higher pressures will aerosolize more paint leading to less efficient application so operate at the lowest pressure that produces an even fan.
5. Now you&#;re ready to have fun! Sprayers especially at contractor grades can quickly lay down a ton of paint. I&#;ve had to go back to the paint store for multiple 5 gallon buckets of primer in an afternoon.
I mentioned this before, but it warrants repeating. Airless sprayers shoot liquid at pressures high enough to cause severe injuries so never touch the tip of a charged gun or spray at a body part.
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