Jump to content

ThirstyBob

Airbrush losing pressure - Help!

Recommended Posts

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

Share this post


Link to post
Share on other sites
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:(

Share this post


Link to post
Share on other sites

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?

 

Share this post


Link to post
Share on other sites

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.

Share this post


Link to post
Share on other sites

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?

Share this post


Link to post
Share on other sites

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?

Share this post


Link to post
Share on other sites

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

Share this post


Link to post
Share on other sites
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.

Share this post


Link to post
Share on other sites

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.

 

Share this post


Link to post
Share on other sites

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.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

  • Recently Browsing   0 members

    No registered users viewing this page.

  • Similar Content

    • By paedia
      [Warning: lots of images incoming]
       
      Next up on my table are the miniatures from Cerebria: The Inside World, a boardgame from Mindclash Games in which the forces of Bliss and Gloom vie for control of an evolving personality.
       
      I'm going to try to do these two at a time (one from each team); the first two will be Harmony and Malice.

      Session 1 - prime + zenithal highlight
       
      Harmony

       
      Malice

       
      Session 2
       
      Harmony
      With the airbrush, I did base+shading of the wings and base of the body. Colors used:
      - Twilight Blue
      - Snow Shadow
      - Surf Aqua
      - Violet Light
      - Sunset Purple
      - Maggot White

       
      Malice
      For malice, I'm starting with the NMM-bronze-ish body. I base coated with Khaki Shadow, then used Ghoul Skin and Moldy Skin for initial highlighting. Shadows are Woodstain Brown and NMM Gold Shadow (which I am not that fond of for Gold, but seems to work well here). Any other color recommendations? I finished up the session with basing the skirt in Redstone.

    • By kristof65
      So my lovely bride got me an airbrush setup for Christmas, and I played with it for the first time last night. Over all, it worked out ok, but left me with some questions that the Airbrushing: The Compendium thread didn't answer:

      1. I "prime" my Bones with Brown Liner.   When I tested on some Orcs last night, this seemed to work pretty decently.  But given the hydrophobic nature of Bones, I didn't thin the Brown liner at all at first, then started adding a bit of water. It definitely seemed to help with the spraying as I thinned it, but I was worried about it beading up. So how do you deal with that on the first layer on Bones minis? 

      2. how do you guys tack down your smaller Bones minis to prime with an airbrush? I found that that the pressure (around 18-20psi) was blowing the orcs all over the place, which led me to having to prime them individually, which defeated the purpose of being able to do a bunch at once. 

      3. I got a sample bottle of the Stylenz primer at ReaperCon - I tried it on some CAVs, but it just beaded up.  Was that an issue with me and the airbrush, or just an issue with Stylenz and Bones? 
    • By SisterMaryNapalm
      As my first airbrush attempt on the Roman centurio was halted by the fact that the figure is so small, I decided to use a different figure, which would be ... bigger.
       
      So in Japan I got me a number of garage kits. One of them was a figure of a nun or mage (I don't know the figure, so I have no idea) and as it was some kind of a miscast or so, I got it for the cheap price of around 6 Euro.
       
      She's big enough to do some airbrush work. And as I want to train airbrushing, I don't want to ruin my first attempt by choosing wrong colours or too difficult painting concepts.
       
      Therefore: YOU CAN CHOOSE THE COLOURS!
       

       
      NO! I really mean it! Gimme some colours, people.
       
      Oh, yeah - That's the figure:
       

       

       

       

    • By ThirstyBob
      Finished Cthulhu on Saturday, I think I'm learning to overcome my fear of highlighting too far, I still didn't go as light as people said I should. Some say you can go practically to white, but I am very hesitant to try that. I think I've made progress though. C&C welcome!
       
      Soft Lighting---

       
       
      Harsh Lighting, to show detail----

       
       
       
      And WIP thread if anyone is interested...
       
       
    • By ThirstyBob
      Got my start on Cthulhu last week. Did a prime in black, then zenithal pre-shade white from above. Purple from below, then green from above. Liking the effect so far, think I'm done with the airbrush, gonna move on to regular painting.


  • Who's Online   38 Members, 0 Anonymous, 143 Guests (See full list)

×