What Size Air Hose are u Painting With? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 08-06-2006, 04:02 PM
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What Size Air Hose are u Painting With?

All,

As part of my "getting ready to paint" phaseI read the forum posts and got my first compressor (5 hp - 22 amps - 2-stage 80 gal unit), ran some 3/4 inch hard copper lines, put in three drops, with ball valves to collect condensation, etc. and bought 65 ft of 1/2" air hose - all with 3/8" fittings. I also have two Devilbiss guns (A Finishline III for primer, and a GFG-670 plus for the base/clear). My goal was to achieve good airflow with low water as recommended by so many on the website.

My question is about the air hose. I HATE THIS HALF INCH HOSE! I've only used it on my impact wrench, and air ratchet up until now, but it is so big and bulky it is a real pain (note: hose puchased from Northern Tool). As a bonus, most hose reels don't readily accomodate the large hose.

Now, how many of you are really using this big 1/2" hose for paint, air sanders, etc.?

If I can crank the pressure up a bit and go with 3/8" hose I'll just chalk this up to a $150 experiment and let it go at that.

Thanks,

Chris

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Old 08-06-2006, 06:20 PM
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I've painted with 1/2" hose. Didn't turn out TOO awful bad even if I do say so myself.

I'm not a professional paint and only work on my own cars anymore.

Painted my '79 Dodge Diplomat in 1987 with a Worker's Cpm settlement I got from ruining my right hand.

Painted my other BelAir Hardtop between 1990/91 that as fas a my opinion goes still looks good. Never have waxed the car not once. I've wet sanded and polished but never waxed the car.
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Old 08-06-2006, 07:11 PM
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3/8" here with a swivel at the gun connection.
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Old 08-06-2006, 07:26 PM
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LOL... I know shops who still use a 1/4" hose.
The 3/8 is fine with the 3/8 fittings.
1/2" is for street construction or tearing down a concrete bridge.
Total overkill. Unless your painting a 747.
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Old 08-06-2006, 08:15 PM
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3/8" here.
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Old 08-06-2006, 09:02 PM
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Quote:
Originally Posted by Bee4Me
LOL... I know shops who still use a 1/4" hose.
The 3/8 is fine with the 3/8 fittings.
1/2" is for street construction or tearing down a concrete bridge.
Total overkill. Unless your painting a 747.
Accurate and funny
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Old 08-06-2006, 09:44 PM
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3/8 here also
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Old 08-06-2006, 10:21 PM
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I use 3/8" cheap PVC hoses for paintwork, they don't coil up like many of the rubber hoses I've had in the past and they also don't breakdown inside like rubber hoses do. When a rubber hose starts breaking down inside it usually spits tiny black specs into your fresh paint, the hoses break down faster in a bake booth. The PVC hoses sell for about $15 for 50feet at my local Carquest, NAPA, and Autovalue but they get orded in as the stores only stock rubber hoses. A 1/2" PVC hose really wouldn't be all that bulky IMO considering the thin wall compared to rubber. Add a desicant snake to the begining of the hose for another $15 if you don't have a good drier-these work well IMO as extra insurance. When the hose is not in use unplug it from the wall plumbing and keep is sealed when in storage by plugging the male connector into the female end so the desicant doesn't pull moisture from the air. Bob
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Old 08-06-2006, 11:10 PM
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3/8" inch rubber hose with 3/8" inner bore connectors so not to limit
cfm !

><
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Old 08-07-2006, 05:54 AM
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I did a test a while back and posted the results here.
I put a pressure gage on a quick disconnect and checked pressure
losses to the gun (trigger pulled) with various combinations.
I found that switcing to the larger 3/8" air fittings made a huge difference
and lowered my pressure loss 10 to 15 psi.
But when I switched to the 1/2" hose I didn't see a difference.
I tested with a gun that pulls 10 cfm @ 45psi.
Maybe a higher consumption gun would need the larger hose,
but for mine it didn't matter.
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Old 08-07-2006, 03:54 PM
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Air hose

Hi.
What I did when I switched over to HVLP was to get a motorguard canister filter that I wear on a gun belt around my waist. I feed the filter with 1/2 inch hose. From the filter to the gun I use 3/8, so it's a short length from my waist to the gun. All the heavy stuff is hanging off my waist and not my arm. Plus the air is filtered close to the gun so anything in the hose gets filtered out, and I use a gun filter too. Less chance to drag a hose through the paint too.

Good luck.
John
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Old 08-07-2006, 04:48 PM
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3/8 here. At and old production job I had, Osha must of come in and decided we needed a vacuum system for sanding with air tools. They put in a bunch of ducts in, and a humongous hoses to hood onto our da's and 8" orbitals. What a pita to work with. I usually ended up saying screw it and unhooked the vacuum. I did get written up for it one time too. I tried using it, but it was such a pain to drag around and move the air tools when sanding. It was also one of the few jobs that had a air supplied hood we could use if we wished. That was a big hose that was hooked up to that too, just what I'd need is to drag that big hose around too, so I never really used it. So I know what you mean when you say you want to go back to 3/8. Now if any places where I painted would of actually had an air supplied respirator, I probably would have learned to deal with the hose issue.
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