Paint coming out before pulling back on trigger

Hi all,

New member here, used to airrush a lot but stopped for aw hile and now getting back into it.

I'm having a problem with a Hader and Steenback Evolution airbrush that, when I press down on the trigger, I'm getting paint coming through before I pull back, which is anoying for fine detail work. I've cleaned the airbrush throughly and it worked fine for abotu five minutes but then started again. When I return the trigger forward and should only have air, I'm still getting a very thin stream of paint.

I was advised to use light machine oil, but that only made the problem worse. I was also advised to clean the trigger and back end of the airbrush, which worked for a while but then the problem returned.

It's happenign on a variety of paints: Molotov, Wicked and Aerocolour inks.

Many thanks in advcne for any help offered!

Paul.

Sound like either your nozzle needs a good soak in Restorer (by createx) due to still having a clog that is not allowing the needle to seat or you have a crack in the nozzle. But you say it only does is after a few minutes of spraying I say clog. What is your reduction ratio and PSI ?

Never us machine oil . OIL AND WATER DO NOT MIX !!! and that is what happens when you use machine oil it caan get into places you do not want it too.
So get some of this http://www.coastairbrush.com/proddetail.asp?prod=Restorer and only soak the nozzle. it does not really play well with rubber parts in some airbrushes .

I agree, sounds like the nozzle is dirty. The needle isn't seating properly so paint is escaping. If you gently move the needle in and out by hand and if its spongy or sticky its definitely old paint in the nozzle. Working for a few minutes then happening again could mean either it wasn't quite clean to start with and quickly builds up, or possibly if your paint is old, it may have "gone off" and is fairly quickly causing a blockage. Paint can last years but does get affected by temperature depending on how its stored.

Soak and clean the nozzle, test it for stickyness, and if needed use a new bottle of paint.

I agree with the nozzle being dirty , also check if the needle completely returns to its original position when you release the trigger

What is most likely happening is you have air leaking into the paint chamber behind the nozzle which is causing the paint to dry and build inside the nozzle not allowing the needle to seat all the way forward over time. Do not put oil on the need because this causes a thin film on the needle which will gum up over time.

Clean real good as before and soak the nozzle in restorer if you have it. The snug everything down real good. Check also for a cracked nozzle, but if it works for a while and then starts again it isn't a crack. I have this problem with a couple brushes especially when I use Wicked fluorescent colors which are older. The pigment in the acrylic binder is getting old which causes the fluorescent color change. The same will happen with normal colors over time. Try a new bottle of paint after the next time and see if it is eliminated. Also before each painting session loosen the chuck nut and give the needle a quarter turn and reseat the needle. This insures even ware.


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Hey guys!

Thanks so much for your input. I am (well, was) pretty sure the nozzle was clean, but I'm only cleaning it by hand and a bit scared to be too rough with it in case I do crack it. I don't have any restorer, but will try and get my hands on some over the weekend.

Points noted abouut not using the oil and turning the needle!

Restorer is brilliant stuff, its reusable so its also economical. just don't submerge standard non Teflon seals in it.....
I find a long bristle artist brush good for getting into the nozzle and dislodging paint once its been soaked. no danger of nozzle damage either as long as you keep the metal way from it

Paulb23 said:

Hey guys!

Thanks so much for your input. I am (well, was) pretty sure the nozzle was clean, but I'm only cleaning it by hand and a bit scared to be too rough with it in case I do crack it. I don't have any restorer, but will try and get my hands on some over the weekend.

Points noted abouut not using the oil and turning the needle!

Click to expand...

You can also sharpen down a toothpick to fit in the nozzle for cleaning or take an old needle and rough it with a file then let it drag on some cotton balls to pick up some of the fibers twist it on the needle tip and soak it in a little cleaner and the twits inside the nozzle in the same direction so the cotton doesn't unwind in the nozzle. This trick is One Kirk at Iwata shared with me.


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This cleaning set is very helpful.