I recently got a Paasce VL double action AB with a Copykake compressor.
I haven't used it much since i got it. I am curently trying to airbrush my hummel and i keep having problems. Sometimes when i am spraying a very wet patch appears suddenly, causing the paint to , kind of like splat. Not a thick splat, but very runny. At first i though iwas improperly mixing my paint, but i do not believe that is the problem.
When ABing, i try to always start not spraying on the model. While trying to do my camo scheme, i will let the air out before hitting the paint release. This is when i noticed, that with not releasing the paint, i will occasssionally get that wet splat.

SO my question, if you understand how i explained it, is: does that sound like moisture in my airline?
Thanks

I am not familiar with a Copycake?? Compressor....

Does it have a reservoir tank??? If so, when you are finished airbrushing for the day, do you release the air pressure in the tank???

If you compressor has a tank, and you don't release the pressure after use, compressed air does have moisture in it, and if left in a tank compressed the moisture can drop out of the compressed air, thus the next time you use it, you can get water in your airline.

Also depends on how humid it is where you are....the more humid, the more moisture in the air, the more moisture you will get when you compress the air.

Wouldn't hurt to have a water trap on your airline...I have both a water trap and release the pressure in my tank when I am through, and I paint in a humid basement, and don't get water im my lines.

It could be but is more likely to be a little bit of thinner left over when you last cleaned it. when you hit the button this is the first bit of fluid to be released before your paint.

No, it is not that. I have been taking all the precautions i could. But , i do have a filter trap now anyways. I will update if the problem disaappears.
btw, my AC doesn't have a tank.
thanks

Update! It is moisture in the lines. I resprayed my hummel, this time with a filter. I had no problems with the base coat. But when adding camo stripes , the little splats of water happend again.
I thought i had a water trap, but i am not experienced with these, so i do not know how long it will work.
I am in a humid basement.

I used to spray in a humid basement..... I got a Dehumidifier to help with the problem...... Spraying is alot better now!!

That's definitely water. Leftover thinner would simply give you an overthinned spray at the beginning of your session.
The splat, as you call it, happens suddenly, has a large roundish central portion and multiple arms spreading out from there usually wit a droplet at the end. If you're using enamels, there's minimal color to it, but with acrylics, you'll tend to have more, since the water can mix with the paint.
If you think about what the compressor does, you'll understand why this happens.
It takes air in and squeezes it down, compressing it. Along with the air comes water vapor, humidity, always present but more so in warm air, the molecules of the air being further apart. In very humid conditions, the vapor, too, is being condensed and sudden, relatively large amounts get pushed through the hose.
A water trap is placed along the hose or at the exhaust port of the compressor and allows the water to condense safely out of the stream of air.

Al is 100% correct and to the point. If you are going to use an air brush -compressor combination, and you don't have a moisture trap.... some day the "splat" will most likely happen to you. It happened to me once and ruined a TBF Avenger. It won't happen again.