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Antique Tractor Paint and Bodywork

GRITTY PAINT

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FARMIN RED

08-03-2004 06:22:37

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I am new to painting and I am having some problems. Last night I was shooting some primer out of a gravity feed hvlp gun. the result on the piece that I was priming came out very gritty feeling. It seemed that I could not get enough paint to flow from the gun like I wanted to. I tried adjusting the air, paint flow, And the pressure to the gun. I ran about 35 pounds of pressure. It also seemed to have a very narrow paint fan. What am I doing wrong. Lots of help is needed.

P.S.

I don't know if this has anything to do with it but it was extremly humid last night. When I was painting about 9:30 p.m. due was starting to collect on the vehicles out in the driveway.

Thanks

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Rod (NH)

08-03-2004 11:48:37

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Re: GRITTY PAINT in reply to FARMIN RED, 08-03-2004 06:22:37

It sounds like you are using a lacquer primer-surfacer, perhaps with too small a tip size and/or too fast a thinner for the temperature, or as Gene says, not enough thinner.

1. Make sure you are thinning to the manufacturer's recommended amount
2. Make sure you are using the proper thinner/reducer for the temperature
3. Make sure you are using the tip size recommended by the primer manufacturer
4. Make sure you are using the correct pressure for your HVLP gun as recommended by the gun manufacturer and usually indicated on the gun handle.
5. Make sure you are measuring the air pressure right at the gun inlet downstream of any regulating device, with the pattern adjusting screw backed all the way out and the gun trigger pulled
6. Make sure you have the gun fluid control knob backed almost all the way out

Rod

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Gene B

08-03-2004 07:28:49

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Re: GRITTY PAINT in reply to FARMIN RED, 08-03-2004 06:22:37

Just a guess but it sounds like your primer was far too thick for spraying. Try thinning it more and spraying it at 50 to 60 psi. My primers are mixed about 50/50 or more depending on the thickness of the primer.
Good luck!

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Jim Ulmer

08-04-2004 01:23:03

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Re: GRITTY PAINT in reply to Gene B, 08-03-2004 07:28:49

You did say you were using a HVLP gun so the 35psi is about right. Too small of a tip or not enough of the right thinner are the most likely problems.

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