Help with urethane primer
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Lead Driver
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From: Near Los Angeles
Help with urethane primer
I am having a problem with spraying Summit urethane primer. I thin it 4:1 with activator, and add a small amount of reducer. My gun has a 2.0 tip, and I'm using about 45 psi air. With that, I am getting like half the amount of primer out of the nozzle as I should, or as I have with other guns. Because of that, I am having to move the gun very slowly just to get coverage.
I'd like to get this sorted out since I have a complete paint job coming up.
Am I not using enough reducer? Not enough air pressure?
I'd like to get this sorted out since I have a complete paint job coming up.
Am I not using enough reducer? Not enough air pressure?
Fleet Owner
Joined: Jul 2006
Posts: 20,362
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From: Mi'kma'ki
That should flow from a 2.0 tip nicely. Is the ambient temp, primer and surface warm enough? Don't add to much reducer because you want it to build high, but are you running the right flow reducer for the temps? Can you try warming up the primer before spraying? Are you sure the gun is clean, tip and air vent in the cap?
Last edited by FORDF250HDXLT; Feb 9, 2026 at 07:57 PM.
Thread Starter
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Lead Driver
Joined: Mar 2008
Posts: 7,182
Likes: 381
From: Near Los Angeles
That should flow from a 2.0 tip nicely. Is the ambient temp, primer and surface warm enough? Don't add to much reducer because you want it to build high, but are you running the right flow reducer for the temps? Can you try warming up the primer before spraying? Are you sure the gun is clean, tip and air vent in the cap?
Fleet Owner
Joined: Jul 2006
Posts: 20,362
Likes: 823
From: Mi'kma'ki
Yeah, base and clear shoot way easier than high build for sure. The gun will act totally different shooting lighter paint, though you want a 1.4 tip for base and 1.3 for clear. The 2.0 or even 1.8 would be run city. Still, I'm surprised w/ a 2.0 tip, the high build didn't spray right out for ya. Probably a gun issue.
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