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I'm having a problem with my finish line flg 3.. I'm getting air bubbles blowing back up into the cup of my gun causing the paint to spit out when I try to spray.. Is there any reason this would be happening. I've pulled it apart and cleaned it all still no luck

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Make sure that the vents on the gun are clean and if the problem is still present then you have a problem with wear on the bushing or the needles. Air is blowing back into the cup before the needle is opening enough. So this could be a pressure, timing or wear issue.

Posted on Nov 25, 2013


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Posted on Jan 02, 2017

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SOURCE: vaper primer gun has intermittent air supply

Does it come with instructions? The material thickness is VERY IMPORTANT when choozing the proper nozzle.

Posted on Feb 04, 2009

  • 1 Answer

SOURCE: Gravity feed gun has bubbles in the cup

I was in desperate need of getting on with lacquering a guitar and it seemed everywhere I looked on the net just gave actual spray pattern issues.
There was a small article that suggested tightening the nozzle up. I had only finger-tightened it.
Problem now solved!!!

Posted on Dec 08, 2009

  • 700 Answers

SOURCE: Hello, the gun has been

as you did not provided exact model - i assume that this one is gravity feed.

this is generic solution for your problem, assuming that there is no crack in the nozzle.

you mentioned that you cleaned it - did you removed little filter on the bottom of the cup and changed for new? they cost just few cents each and get clogged easily. replacing them is more cost effective than cleaning them.

now, i would suggest removing paint from the cup, wash with appropriate solvent and spray little solvent through. fill now cup with about 1/3 to 1/4 paint stripper and spray that to sink or other receptacle - DO NOT FORGET GOGGLES OR EVEN BETTER - FACE MASK! YOU HAVE ONLY TWO EYES AND NO SPARES!

just in case - prepare 2 or 3 pints (1 to 1.5 liter) of water with few spoon of vinegar in it - it will neutralise paint stripper if splatter on your body or paint which you want to preserve...

now, prepare sheet of butcher paper, pull gun apart removing the needle, check tip for dirt, damage, bends - clean and repair if necessary or exchange needle for new one. needles are usually made of stainless and have dull sheen on them

check nozzle - remove any residual paint, check for cracks and any physical damage, i do that usually at 20x magnification for airbrushes and 5x for other air guns. there are temporary repairs to cracks but usually replacement is only solution.

grease lightly all springs and working surfaces with ptfe dry spray, if you do not have that grease, use petroleum jelly (vaseline).

put gun together in reverse order in which you disassembled it (you put parts in the order on the butcher paper? :-)).

now, i assume you know what each button do on your gun, but just in case, bottom screw (closest to the air input) regulates airflow to the gun, middle screw regulates volume of the paint, and top screw or in some models side screw regulate pattern. close all screws.

fill cup with water (you did insert new filter?), there should be no leaks of air or liquid anywhere, needle should be not retracting.
open air volume screw on the bottom to the desired pressure, in case of water based paints - it is about 40 to 60, depending on the thickness of the paint.
hold needle retracted and lose the liquid flow till you achieve regular flow from the nozzle, on vertical surface for about 15" (400mm), diameter of the water circle should be about 8" to 10" (200mm to 250mm), it can be bit more if you are using very, very thin paints, inks for example or solutions,
now, go to third valve and open it till you acquire desired oval.
that is all what it is for setting up any airgun, including airbrush (only diameters and distances are smaller).

now, water based paints have nasty habits of precipitate from the solution, only way to avoid that is to shake it well before every refill of the cup and filter as it go to the cup. 100 filters will set you about $15.00 in paint store (in hardware store it will be about 10 of them for same money....).

now, we check everything, is clean and spanky - and still clog the nozzle... problem is paint is too thick and you need to replace nozzle for large one, most "solid" water paints require at least 1.8mm nozzle and up to 25% dilution, i am usually using 2mm or even 2.5mm or bigger nozzle for water paints.

if you try to spray water based latex paint - you need a minimum 2.5mm nozzle, i am using even 4mm for that particular paint.

if you find my answer useful - do not hesitate to put some points my way... if you have any questions, including some clarification - feel free to ask.

Posted on Oct 24, 2013

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Taking care of your tools and supplies is an essential in their upkeep and increasing the life of your tools. When you neglect to take care of your tools they will get clogged or ruined and eventually will stop working. This same principle applies to your air brush gun, if you don't take care of it and clean in properly after each use it will get clogged and will stop working.

After each use you want to make sure that you get all the paint out, to do this you should add a little bit of warm water to the cup (where the paint goes in) and then pour it out into the trash. You must be sure NOT to use hot water because it could melt or warp small plastic pieces inside the gun.

Fill a bowl or tub with clean warm water, connect the air brush to the tube, plug it in and turn it on. Placing the needle and the cup under the water and pull the trigger. Run water through it for a few minutes to make sure that no color comes out of it. If paint does come out of the gun you will need to change the water.

When the water runs clear through the gun take it out of the water and fill the cup with clean water. While placing your finger over the needle cap pull the trigger. This will make the air flow backwards through the gun causing bubbles to form in the cup. If there is paint stuck in the gun it will come up in the bubbles in this step. Pour the water out and place the needle and cup in water again and pull the trigger.

When you feel that it is clean, take the gun out of the water and spray your gun on a white napkin or paper towel to make sure there is no color in the spray. If no color comes out you are all clean and ready to use your airbrush gun again.

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Are you straining the paint through cheese cloth or some other type of strainer ? Trash in the paint building up around the tip could cause it, straining will eliminate that. The return spring, or the grommets depending on what type of gun your using could be wore out keeping the needle from seating closed all the way. Is it when you stop spraying or during. May need to change the pressure setting or tip size for the material you are spraying, again, depends entirely on your specific situation as to what could be causing the problem. But these are things you can try. The paint store would probably be able to point you in the right direction if it comes down to changing tips. Might be worth a call to save yourself more aggravation. hmmm,, goes to show how observant I am,, sanchezauto,, are you painting cars,, with a conventional cup gun ? All of any of the above could apply. And if your painting cars you sure don't want a spitting gun messing you up. (-8

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