I sprayed a coat of white and have several spots where the paint feels rough.  I had it thinned about 60/40 with a small amount of retarder in the last coat for humidity.  Is this a sign that I need to thin the mix more or adjust the pressure (spraying around 20-25lbs)?

Thanks,

James

I sprayed a coat of white and have several spots where the paint feels rough.  I had it thinned about 60/40 with a small amount of retarder in the last coat for humidity.  Is this a sign that I need to thin the mix more or adjust the pressure (spraying around 20-25lbs)?

Thanks,

James

I agree with Randy, the dope was too dry.  I'd thin it at least 50/50 & depending on the temperature you can go to 60% thinner/40% dope.  Test the gun with the dope you are going to use on a piece of clean cardboart (side of a box, for instance) just do a quick squirt with the gun not moving & look at the pattern.  The pattern should be a long thin oval (thin at the top & bottom and thicker in the middle.)  Painters tend to say "if the pattern is right the pressure is right." If you are dealing with lots of humidity then a little retarder is OK, but make the retarder not more than 10% of the total thinner you use to thin the dope.  Retarder can be good up to a point, but some conditions are just outside of the envelope of the material you are using.

Don't forget distance from the surface.