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ThirstyBob

Airbrush losing pressure - Help!

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So today when I started airbrushing, I noticed that after I sprayed a bit the pressure on the tank was dropping, which made it difficult to get an even coverage. I'd start at around 15psi, and it would hold for a couple seconds, then drop steadily until it was down at 5psi. Turning up the pressure did not help, it still dropped psi. I took out the needle and checked and cleaned it and the rest of the ab, then tried just shooting air through, without needle or anything but the nozzle lever. Same result. Seals are airtight at least until I start shooting air through. I have a Paasche TG-3F, bought it with the compressor in a package deal, compressor has a humidity filter on it.

 

EDIT: Just noticed that while air is going through the airbrush, adjusting the pressure does nothing at all. I can turn it up or down and it stays at 5psi. Unless I reduce the pressure below 5psi, then it goes down. Adjusting the pressure when I release the airbrush changes psi normally.

Edited by ThirstyBob

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5 hours ago, ThirstyBob said:

So today when I started airbrushing, I noticed that after I sprayed a bit the pressure on the tank was dropping, which made it difficult to get an even coverage. I'd start at around 15psi, and it would hold for a couple seconds, then drop steadily until it was down at 5psi. Turning up the pressure did not help, it still dropped psi. I took out the needle and checked and cleaned it and the rest of the ab, then tried just shooting air through, without needle or anything but the nozzle lever. Same result. Seals are airtight at least until I start shooting air through. I have a Paasche TG-3F, bought it with the compressor in a package deal, compressor has a humidity filter on it.

 

EDIT: Just noticed that while air is going through the airbrush, adjusting the pressure does nothing at all. I can turn it up or down and it stays at 5psi. Unless I reduce the pressure below 5psi, then it goes down. Adjusting the pressure when I release the airbrush changes psi normally.

I know this may be a dumb question, but you mentioned a tank and humidity filter, did you make sure the tank and filter's valve releases are tight? I know I have drained my tank and filter, then next go around I get air leaking because I forgot to tighten the valves closed:(

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What kind of compressor are you using and does it have an air storage tank?  Does it normally work and level out at a higher pressure with that brush?  It may be that the motor is wearing out and is having a hard time supplying the pressure to the brush.  Or as Ratmaster2000 said there could be an air leak in the system.  When not engaging the trigger of the brush can you hear air escaping anywhere?

 

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For clarity, can you hear the piston running while the pressure is dropping?  

 

I'm wondering if the regulator is not functional and not detecting the pressure drop correctly to turn the compressor back on to replenish pressure.

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It's an auto shut off tank, it turns on for a few seconds when you power it on, and then turns off until air is released. So if the filters weren't tight, I believe it would turn on every few seconds? There is no sound of leaking either. The Airbrush works fine at first it's just problematic for getting even coats if the pressure drops down to 5psi. Would it be the motor if the compressor has no trouble running without the brush connected?

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If you switch it on, wait for it to reach pressure, then leave it sitting there, without using the airbrush at all, how long until the compressor starts up again?

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It doesn't ever, I usually leave the compressor on with a quick release valve on it that I just slot the airbrush into. Maybe I shouldn't be doing that?

Also the compressor is also a paasche brand compressor, came with the brush. I'll check the model number later.

Edited by ThirstyBob

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1 hour ago, ThirstyBob said:

It doesn't ever, I usually leave the compressor on with a quick release valve on it that I just slot the airbrush into. Maybe I shouldn't be doing that?

Also the compressor is also a paasche brand compressor, came with the brush. I'll check the model number later.

 

You mean you always leave it on or just leave it on when you're using it? If you are always leaving it on and never draining the tank it's going to eventually rust out inside.

 

Your current problem sounds like the compressor isn't keeping up with the pressure demand. Does it take longer to build up to full pressure from empty than it used to? My guess would be a gasket in the compressor or the motor itself is wearing out.

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It doesn't seem to , same speed to get up to full pressure, just drops after I start painting. I haven't had it for very long, under a year. I also don't use it very frequently. I may have put some extra strain on it by leaving it pressured up all the time though.

 

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I'd probably start by using soapy water on all the connection point to verify there isn't a leak somewhere. A third possibility if it isn't a leak would be the regulator controlling the on and off. If it's a Paasche though, and you've had it for less than a year, you should just call them and ask. It should still be under warranty.

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