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second half 2 0

19:12 recording · AUTO · 2 speakers

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Brief overview

Air-assisted airless spraying atomizes coating at low pressure, cutting overspray waste and roughly halving coating usage.

  1. Low pressure buys transfer efficiencyThe higher you crank the pressures, the better the atomization but the worse the transfer efficiency, so use the least you can get away with.
  2. Pump ratio times air equals fluid pressureOn an 18 to 1 pump, 35 pounds on the regulator lands near the 500 pound fluid pressure target for this pigmented material.
  3. Water-based coatings demand filter disciplineDried water-based material never re-dissolves, so filters must be checked often and the tip scrubbed with water, alcohol or acetone.
Executive Summary AI
  • A pure airless sprayer uses hydraulic pressure only, often over a thousand pounds, which makes the material leave the gun so fast that much of it bounces off the substrate and is wasted.
  • Air-assisted airless adds a small amount of atomizing air, typically only 15 or 20 pounds, with fluid pressure around four or five hundred pounds, so the material leaves slowly and mostly sticks to the wood.
  • The instructor argues a shop can cut its coating usage roughly in half with one of these pumps instead of a handheld air spray cup gun, and jokes that the clouds of overspray are how coating suppliers make their money.
  • He explains the pump ratio: this is an 18 to 1 pump, so 10 pounds of air gives 180 pounds of fluid pressure and 20 gives 360, and he sets the regulator to 35 pounds to reach roughly 500 pounds for this pigmented material.
  • He then purges the water out, checks the inline filter (critical for water-based coatings that will not re-dissolve), primes with the coating, sets a vertical fan pattern, and tunes dynamic pressure and atomizing air until the tails disappear.
Key Quote
“You can cut your coating usage probably in half by using one of these pumps versus just one of those air spray handheld type of cup guns.”
— Speaker
Key Quote
“So that means for every 1 pound of air I provide this from my compressor, it will generate 18 pounds of fluid pressure.”
— Speaker
Key Quote
“So the thing I like about this idea is I've gotten a face full of fluid many times.”
— Speaker