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Ask the Expert Question-and-Answer Archive by Ron Joseph October, 2005 Orange Peel Paint Defect with HVLP Spray Gun Q. I am trying to spray my truck but can't get rid of the orange peel effect. I am using an HVLP gravity feed gun. I am spraying with NASON Urethane paint. The paint calls for 8-parts paint 1-part catalyst and 2-parts reducer. I am spraying at 10 lbs pressure. I have heard a couple of different ways to possibly eliminate the problem but nothing has worked yet. I could really use your advice. Thanks . A. You are probably using way too little air pressure. I assume that when you
say that the atomizing pressure is 10 lbs you are referring to the pressure
that you read on the pressure gauge at the handle of the spray gun? Well, if
that it so then I'm not surprised that you are getting orange peel. I don't
know which HVLP spray gun you are using, but you are permitted to increase the
atomizing pressure so that it reads 10 lbs per square inch (psig) at the CAP of the gun ... not at the handle. Special pressure gauges can be purchased
from the spray gun vendor to measure the pressure at the CAP. If you
refer to the spray gun manual it will tell you what the maximum pressure is
at the handle of the gun to give you 10 psig at the cap.
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