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Weird Aztek problem!

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  • Member since
    August 2019
Weird Aztek problem!
Posted by dreadpyrat on Sunday, August 25, 2019 6:33 PM

Hi, 44 yo modeler here - actually my first time posting, but been a subscriber for years!

I just got my first airbrush, a metal body Aztek, with a Master Air tank compressor. I've followed instructions to the "tee" and cannot get it to reliably spray paint during its first two runs. Here's what I did on test #1:

I loaded up som Tamiya flat black acrylic 2:1 thinned with Tamiya AB thinner and put it in a gravity cup. I set the dial on the back of the brush to the far right (single action) - it sputtered and coughed and threw a few passes of paint. I set it to dual action (dial all the way to the left) and it stopped working properly. Paint barely came out, but coughed out of the sapce around the trigger a couple of times. I stopped, cleaned the tip in windex overnight, and sprayed a bunch of windex thru the brush in both action modes until it ran clear. (Or clear blue in the case of Windex;) 

Test #2:

I tried painting again today with a siphon bottle of the same thinned paint and now it wont spray any thing at all - just air. So I filled a gravity cup with windex and got it to spray but it was frothing and bubbling windex out of the gap around the finger trigger. after a while, the froth turned black - maybe some old paint? I ran it until it was clean but I'm bewildered: why wont it spray paint properly? Why wont it work with a siphon bottle? This brush is brand new! 

Can anyone shed some light on this? I'd greatly appreciate some advice! Thank you. Rob

Tags: Airbrush , aztek
  • Member since
    October 2008
  • From: Fullerton, Calif.
Posted by Don Wheeler on Monday, August 26, 2019 10:39 AM

My advice is to contact Testors about a replacement.  Somehow paint got into the body of the airbrush and eventually it will cause trouble.  When you get a new one, try it with plain water first.

Don

https://sites.google.com/site/donsairbrushtips/home

A collection of airbrush tips and reviews

Also an Amazon E-book and paperback of tips.

  • Member since
    May 2013
Posted by Snibs on Monday, August 26, 2019 3:44 PM

What nozzle are you using? had mine for well over a decade and used only the grey nozzle without a problem although I have always used enamels. Paint may need to be thinner also.

Mick.

My airbrush and modeling page.

Two cheap spray booths compared, the BD-512 and HS-E420DC

On The Bench.

German V2.

F/A-18A. 

P51D

 

  • Member since
    August 2019
Posted by dreadpyrat on Monday, August 26, 2019 3:54 PM
Thanks Don! I've contacted Aztek about a repair/replacement. Fun fact I didnt know until today: Testors is owned by Rustoloeum!
  • Member since
    August 2019
Posted by dreadpyrat on Monday, August 26, 2019 3:55 PM
I used the grey one as well. The paint was really thin so not sure that was the issue. Any good tricks for striaing the paint first? Should I pour it thru cheesecloth before loading into the brush cup?
  • Member since
    November 2018
Posted by oldermodelguy on Monday, August 26, 2019 4:23 PM

When you say 2/1, what part is the 2 ? If it's 2 parts paint it just may not be thin enough. I cut Tamiya paints 100% ( 1/1) usually, with a few exceptions.

  • Member since
    May 2013
Posted by Snibs on Monday, August 26, 2019 4:26 PM

Not being a acrylic user I can't help a lot but I use a little electric Trumpeter stirrer for my enanel and stir for a few minutes at least, should not need cheesecloth., if you have lumps in the paint just through it out.

Have you played with air pressure? moisture can do what your describing but you should be right if you have a tank on the compressor.

Looking forward to hearing what happens.

My airbrush and modeling page.

Two cheap spray booths compared, the BD-512 and HS-E420DC

On The Bench.

German V2.

F/A-18A. 

P51D

 

  • Member since
    August 2019
Posted by dreadpyrat on Monday, August 26, 2019 5:08 PM
Thats good to know....for me: 2 parts paint, 1 part thinner. I'll try 1/1 next. Thanks!!
  • Member since
    May 2013
Posted by Snibs on Monday, August 26, 2019 5:31 PM

Keep thinning until the brush is happy with it.

My airbrush and modeling page.

Two cheap spray booths compared, the BD-512 and HS-E420DC

On The Bench.

German V2.

F/A-18A. 

P51D

 

  • Member since
    November 2018
Posted by oldermodelguy on Monday, August 26, 2019 6:04 PM

dreadpyrat
Thats good to know....for me: 2 parts paint, 1 part thinner. I'll try 1/1 next. Thanks!!
 

It's goning to seem thin, but it usually sprays fine with maybe one added coat. I mix just shy of 1/1 to 1/1 to 10 or 15% over 1/1 or so. What ever gives the right flow down the side of the cup and resulting spray pattern..

  • Member since
    August 2019
Posted by dreadpyrat on Saturday, August 31, 2019 2:17 PM
Thanks again! will definitely try the 1:1 paint/thinner ratio next. Appreciate all the help fellas!
  • Member since
    September 2012
Posted by GMorrison on Saturday, August 31, 2019 3:22 PM

The Aztek is a problematic airbrush. The changeable tip "cartridge" is the cause. Unlike any othe airbrush that I'm aware of, the  spring that works against trigger pull to move the needle and open the orifice, is in the paint path. Most airbrushes have the needle and spring in the main body, and the paint is introduced forward of that.

You'll have to learn how to take the tip assembly itself apart in order to remove the spring and other parts and clean them.

I struggled with my Aztek for a few years, and finally switched to a Badger.

Another often overlooked problem with all siphon airbrushes is that the pot needs to ingest air just as fast as it gets sucked out. There's some type of relief hole on the cup. Make sure that it is completely clear.

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