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TOPIC: Airbrushing Question

Airbrushing Question 03 Aug 2017 23:53 #1

Hi guys - I have an airbrush troubleshooting question. I think I know what's going on, but I want to make sure.

While I was painting tonight, I started to notice that when I pushed down on the trigger to activate the airflow, some liquid spurts out. Its a clear liquid, not the paint. This liquid continues to sputter out pretty randomly. Causing a lot of splatter to my paint finish.

I am guessing that I'm just getting water in the airline (humidity in Florida is around 80% right now) and either the moisture trap on the compressor can't keep up, or the water is condensing in the hose.

Anyone else ever had this happen? And have a good fix?

Thanks
Mike
Last Edit: 03 Aug 2017 23:54 by Skinny_Mike.
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Airbrushing Question 04 Aug 2017 00:14 #2

Could be water in the line. Are you getting a lot when you clean the water trap? If so maybe an inline filter would help? Did you clean this recently? could you have some moisture in the brush from your last cleaning? I wish I could help you more apart from the questions but my airbrushing sucks and I cant figure out why.
If humidity by the way is always bad maybe a dehumidifier in your paint shop would cut sown on the problem some.
James
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Airbrushing Question 04 Aug 2017 00:28 #3

There is water coming out of the trap. Unfortunately I airbrush in the garage, so a dehumidifier would have a hard time keeping up. I decided to order a filter that sits at the airbrush itself. Hopefully that'll help.
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Airbrushing Question 04 Aug 2017 00:44 #4

The one that acts like a handel? I'd be interested in your thoughts when you get it. I have wondered about them.
Good luck, hope that solves it.
James
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Airbrushing Question 04 Aug 2017 09:14 #5

yeah - that's the one.
I'll let you know how it works.
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Airbrushing Question 04 Aug 2017 09:21 #6

Mike, do you have a compressor with a tank? If so, you need to drain that tank frequently during humid times. I take mine outside in the grass to drain it, the water is usually rusty and will stain concrete. I let the pressure build up until the compressor cuts off, then open the drain valve on the bottom of the tank slowly at first, then all the way to let the air force the water out. You'd be amazed at how much is in there. :ohmy: :pinch:
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Last Edit: 04 Aug 2017 09:23 by Iron Mike.
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Airbrushing Question 04 Aug 2017 09:45 #7

Besides humidity, the act of compression heats up the air. High humidity could be overwhelming the trap, but you could also be getting condensation in the hose after the trap.

Iwata makes a nice pistol grip trap, but you can also get one of those cheap traps for the base of the AB since you're only trying to cut down on the residual stuff.

I was plagued by what you're getting, I was using a sizable MT at the compressor, not an AB one, but the type you'd get from Home Depot. I added a cheapo ($3) trap at the base of the AB and problem was solved.

I eventually switched over to an Iwata SmartJet compressor that came with a nice trap/gauge and I haven't had an issue since. It may be Iwata uses a very narrow line post trap or that the trap is so efficient, but I haven't needed the added one at the brush.

Nothing is worse that doing a tight camo pattern and you get that water loogie out of nowhere.
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Airbrushing Question 04 Aug 2017 10:54 #8

That's odd, I have a huge compressor from an old gas station, I've tested it a couple of times and never seen water come out. Gotta wonder why that is.
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Airbrushing Question 04 Aug 2017 12:15 #9

My dad made a simple water trap on his Air compressor in the barn ... large pvc in your case about 2 inches should do on bottom He had a drain plug air coming in inlet was lower than air going out the whole trap was only about 1 foot long ... :oldguy
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Airbrushing Question 04 Aug 2017 12:36 #10

moon puppy wrote:
That's odd, I have a huge compressor from an old gas station, I've tested it a couple of times and never seen water come out. Gotta wonder why that is.

It may have to do with tank size. If I use the tanked compressor for tools, I have to drain it all the time. When I worked in a 20+ bay garage, they had a compressor tank the size or a truck and in the summer vapor would shoot out of all the air tools, but the lift valves would spew water like a garden hose when first opened.

The tankless ones I have for ABing have nowhere for the moisture to collect, so if there's no trap, it seems to collect in the hose until it gathers at one point and block, then spits a waterbomb.
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Airbrushing Question 04 Aug 2017 12:47 #11

I lost my old (silent, tanked)compressor because I never knew about emptying the tank! I thought the water trap did that, but eventually I kept hearing a thin, high whistle. I took it to Coast AB before our move to get it serviced before going out to the boonies and was dumbstruck to find that the tank had a tiny hole rusted through that was making the whistle. Had to buy a new (refurb) unit. I vent that sucker now, and because I added too much oil, it spits out oil and water- a real mess!
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Airbrushing Question 04 Aug 2017 12:55 #12

ausf wrote:
moon puppy wrote:
That's odd, I have a huge compressor from an old gas station, I've tested it a couple of times and never seen water come out. Gotta wonder why that is.

It may have to do with tank size. If I use the tanked compressor for tools, I have to drain it all the time. When I worked in a 20+ bay garage, they had a compressor tank the size or a truck and in the summer vapor would shoot out of all the air tools, but the lift valves would spew water like a garden hose when first opened.

The tankless ones I have for ABing have nowhere for the moisture to collect, so if there's no trap, it seems to collect in the hose until it gathers at one point and block, then spits a waterbomb.

I think there's a trap on the intake for the compressor. I'll have to look at it closer, I have another trap on the line feeding my workbench that is always dry, never seen it catch anything, in fact the filter looks fresh. And yes, it is hooked up correctly as I can vent it and air comes out... :rotf

I'll check the tank again this weekend but when I have checked it in the past it's been clean. :idonno
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