#Any idea what could cause an airbrush to not spray like for the first half of the trigger movement?

100 messages · Page 1 of 1 (latest)

clever tinsel
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It is squeaky clean, the inside of the nozzle has a mirror finish when seen trough a magnifier against a light source, the needle is not bent or curled.
I am running out of ideas.
Tried with all kinds of washes and especially MIG shaders.

The video shows how the trigger moves about to the half way point before anything happens, with a splash.

prisma merlin
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It means you've got a clog or your paint needs thinned more or you need to clean the needle or nozzle

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Try just water

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If water goes through easy without that issue, it's probably the paint

viscid ingot
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Have you replaced needle/nozzle with off brand ones?

clever tinsel
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Nope still the stock needle and nozzle it came with. Wondering if after 2 years they may be the issue, but i can not spot any visible defects.

clever tinsel
prisma merlin
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I don't know what a mig shader is

clever tinsel
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A airbrush only diluted wash for transparent shading. It should work without further thinning i'd imagine. Thinning it more made it not settle and spiderleg increasingly.

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But yes, water does work better.

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Curious if any mechanical defect comes to mind that could cause this

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The video above was a fresh drop of shadee after the 3rd full clean of the evening, trying to see whats wrong

prisma merlin
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The most simple explanations are what I said

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Either you need to clean the needle off better, the nozzle out better, or your paint needs to be thinned better, are you using thinner or water to thin or what

clever tinsel
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So there should not be any pre-existing clogs at least

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Scale 75 acryllic thinner

prisma merlin
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Do you happen to have any windex or glass cleaner

clever tinsel
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Yep, I use glass cleaner for cleaning the ab

prisma merlin
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Use it to thin the paint then

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and try that

clever tinsel
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K

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Wonder if it being so foamy may be an issue

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Will have to stir it gently id imagine

prisma merlin
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Not really

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I use it to thin all water based acrylics and it's not a problem

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If that doesn't work, I'd ask what are you cleaning your nozzle with

clever tinsel
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Tried ipa, acetone, and cellulose thinner this evening, then use a paper-point to get through the nozzle

prisma merlin
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a paper point?

clever tinsel
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Funky dentist paper needles, read that on some forum ages ago

prisma merlin
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interesting, that's a good idea

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then I would check the tip of the needle

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if there's any bend

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if not, check the nozzle for a crack or ding or any sort on the tip

clever tinsel
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Couldn't spot anything the like

prisma merlin
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Then it's the paint

clever tinsel
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Yeh

prisma merlin
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Either it's too grainy, or it isn't thinned enough, or you need to strain it possibly

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do you have any solvent based paint

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like tamiya

clever tinsel
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Only a primer

prisma merlin
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what primer is it

clever tinsel
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AK microfiller

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And mr surfacer 1500, but i am not sure thats solvent based

prisma merlin
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it is

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do you have lacquer thinner

clever tinsel
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Oh, ak streaking grime i got too

prisma merlin
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that's enamel

clever tinsel
# prisma merlin do you have lacquer thinner

Nope, still trying to find out what kind of hardware store chemical lacquer thinner is. Some I found seem to be acetone, some "Nitro". Have not dug deeper as i have no lacquer paints.

prisma merlin
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you in the US?

clever tinsel
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EU, germany, hardware store thinners got some really strange naming going on here

prisma merlin
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I see

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here in the US it's just lacquer thinner

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acetone works though

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nitro I think is enamel thinner or something close

clever tinsel
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Yeh i usually check for the english text on the back, its more clear there.

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White spirit is usually "brush cleaner" here for example :/

prisma merlin
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do you have thinner for the streaking grime

clever tinsel
prisma merlin
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then you can't try that

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is the AK primer pre-thinned for airbrush supposedly

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I mean whatever

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forget that

clever tinsel
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It worked better than Vallejo primers at least

prisma merlin
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if water sprays fine through it, you need to thin your paint more, or it's got chunks in it that needs to be strained out, or it's just too grainy to spray easily that way

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but most stuff that says airbrushable, needs to be thinned a bit further anyways

clever tinsel
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But i see what you are getting at, try some proven AB paint to benchmark it

prisma merlin
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yeah but if you don't have thinner for it, I wouldn't bother

clever tinsel
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Yeh ill try with some fountain pen ink maybe

prisma merlin
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it's just that solvent based paint is easier to spray at fine levels like you're aiming for

clever tinsel
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Should be dye based i guess

prisma merlin
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that would work at least to see how well it's working ye

clever tinsel
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Yup, will give that a go tomorrow

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Thx for the help so far

prisma merlin
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Yup

viscid ingot
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What PSI are you spraying at? Does it happen spraying just water?

prisma merlin
viscid ingot
prisma merlin
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bro

viscid ingot
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@clever tinsel honestly I would just check if the nut that holds the needle in the back is tight and if it is then I would replace the nozzle

prisma merlin
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just go straight to spending 20 bucks

clever tinsel
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The nozzle looks pretty great under a magnifier, and i'd assume any kind of damaged or chipped nozzle would spray "more" rather than less?

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unless it was pinched or so but it looks pretty pristine

prisma merlin
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yeah normally a split nozzle means it sprays without the needle being pulled back

clever tinsel
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little update:
Spraying pure water seems to work, its a bit mixed results, at first it took a good bit till it sprayed but after a few runs it sprayed right away. Sound like it blew out a clog but i am still not sold on that. Especially since there was no stain on the plain paper i used for testing.

I emailed Iwata (whos support is amazing btw.) and after a bit of back and forth showing them closeup photos of the parts they suggest using "Medea Thread Sealer" (some kind of beeswax chapstick) to seal all the threads. Me cleaning all the cap parts together with the nozzle apparently removed the factory applied sealer.
Also one should definitely use the little wrench to properly tighten the pressure fit nozzle, which i never really bothered to do either.

Will see if i can get hold of besswax or that sealer and check if it makes a difference.

viscid ingot
# clever tinsel little update: Spraying pure water seems to work, its a bit mixed results, at fi...

That’s good to know, I had suspicion there might be a leak on the nozzle, that’s why I recommended just swapping it. If you want to try and salvage it, here is the beeswax I use:

Alternative Imagination 100% Pure Beeswax Bar (1 Ounce), Made in USA https://a.co/d/9QIdvgH

clever tinsel
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Ah dang, was just out for shopping and got some mostly beeswax chapsticks.
Wonder if a 100% beeswax candle would have worked.

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EU here so even if i wanted, iwatas own thread sealer is nowhere to be found here

clever tinsel
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i would assume most of the cause for this success was due to the added thinner, I may try again without it too

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Just tried without thinner, and while not quite as nicely it also sprays a lot better now.
I would seem the wax and tightening did help!

prisma merlin
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Another thing to try is technique, spraying super thin lines with acrylics is really tough, so instead try rocking the trigger back and forth to get the detail you're looking for

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you won't get thin lines, but you can paint detail that way without spiderwebbing

viscid ingot
clever tinsel
clever tinsel
viscid ingot
clever tinsel
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ITs pretty cool how responsive iwata is