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Old 08-17-2009, 10:03 AM
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Why HVLP air cap paint cones form

I found out this weekend that you can push too much pressure through an HVLP. It ends up resulting in paint "cones" on the air cap. I've had it happen one time before and my buddy Jimmy and I had a discussion about that this weekend. He proved to me that 20PSI at the gun on my Sata RP results in an amazing finish. Better than I ever got running it at high pressure 40-60PSI at the gun. Just thought I'd post this up, I never had it explained to me how or why those cones formed that time.

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Last edited by cyclopsblown34; 08-17-2009 at 11:15 AM. Reason: Stupid person wasn't thinking.
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Old 08-17-2009, 04:58 PM
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Too much air + too wide pattern = "shooting a hole in the pattern" (cones)

I usually set the air, then set the pattern, then set the flow.

The guns that I use work best on about 8-10PSI at the inlet, (where you plug the hose) But they require a high volume of air.
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Old 08-17-2009, 05:01 PM
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ive never seen "cones" before but then again i never had my guns cranked at 40-60. thats what the HVLP stands for high volume LOW pressure
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Old 08-17-2009, 07:00 PM
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I've no eye ear what pressure I use, my gauge hasnt been clean enough to read for twenty years but I set my sata by eye and ear... glass every time...great guns dem germans make ..love my ruger too..
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Old 08-17-2009, 07:03 PM
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Quote:
Originally Posted by st3gamefarm
Too much air + too wide pattern = "shooting a hole in the pattern" (cones)

I usually set the air, then set the pattern, then set the flow.

The guns that I use work best on about 8-10PSI at the inlet, (where you plug the hose) But they require a high volume of air.
Hey neighbor,
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Old 08-18-2009, 08:29 AM
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I was told previously to crank the wall regulator wide open and regulate it with the internal regulator. Now that Jimmy took me to school on this, I get better results with less overspray(Read that foggy booth). I can actually see clearly in the booth using this method.
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Old 08-18-2009, 08:56 AM
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people will tell you lots of stuff,especialy here ...your boy Jimi sounds like he knows his sheet.it all comes with experiance.fun though ,isnt it? body & paint is the only thing thats held my interest,I love it... even after 35 years,I still cant wait to get to work...but who wouldnt love working on hot rods all day? I'd do it for free if I didnt have bills...
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Old 08-18-2009, 09:14 AM
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He enjoys the heck out of the work and is way particular. Seeing him work sheetmetal has taught me a lot more than I've learned on my own in the last twenty years.
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Old 08-18-2009, 09:28 AM
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Ahhh yes, One of my biggest problems and assets is as soon as I master something I loose interest and get bored (mabee its a.d.d.) therefore the longest I've ever worked any one shop was two years and that was only once.I sometimes think its a setback but I've learned so much from so many people,that I'd never change one thing even if I could,I even knew Big daddy Don Gartlits wnen I lived in Fla. ,what a cool guy but a ***** to work for(so I'm told) you ever hear of someone going bonkers because the phillips tip screws that hold a rocker sill plate on were not all going in the same direction? no I wouldn't change a thing and I still learn new stuff every day.... from all kinds of people ,especialy here

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Old 08-18-2009, 09:53 AM
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That's being just a wee bit anal. I enjoy the heck out of doing just about everything with cars from paint to electronics.
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Old 08-18-2009, 10:47 AM
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agreed,but theres a few like that out there,I love electronics,my dad did r&d at GE for years and taught me a lot,I even took two years at trade school but cars is the sheet fer me.How long you been paintin?
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Old 08-18-2009, 10:50 AM
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I've been painting the last fifteen years maybe five or six per year with lots of color sanding. The last two since Jimmy taught me to turn down the pressure to the gun didn't require any color sanding. It's like using my old Model 7 except without the cloud of overspray.

I've been turning wrenches on vehicles the last 28 years. Building engines, installing stereos and tv's, anything except rebuilding transmissions and upholstery.
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Old 08-18-2009, 01:26 PM
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I wonder why they call it color sanding? When the color never gets touched? Its like a hot water heater... who heats hot water?
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Old 08-18-2009, 01:53 PM
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I never understood the hot water heater term for the exact reason you stated.
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