hvlp Finish and temperature

What is the relationship between the temperature of the finishing material and the temperature of the air when spraying? When the product I used is warmed to 70 but the environment I spray in is at 50 and my gun just doesn't work well why?.
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To put it simply the gun works fine it's the finely atomized 70 degree finish hitting a 50 degree surface that doesn't work to well.
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Mike G.
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Assuming you mean the gun itself isn't working as well (as opposed to the application not working well), it's because the atomized spray exiting the nozzle is too cold at 50 degrees. When pressure is released, as in air exiting a paint guy nozzle, cold is generated. It's the same principle that makes and air conditioner make cold - going from hi pressure to lo pressure creates cold. So, the paint is exiting at a lower temperature in 50 degree air, becauswe of the valve assy temp affect on the paint, and atomization is not as complete, as oppposed to the 20 degree increse of having the air temp at 70 degrees. Technically there's much more to it, such as oxidation rates at temps, voc, particle sizes, nozzled designs, etc etc., but them's the basics.
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hope you aren't trying to use water borne finishes at such a cold ambient temp...
dave
ziggy wrote:

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