hi,
i just got my 155 ab, would it be ok to use Urethane paint , and to clean it run thinner thru it to clean the airbrush with out mess it up? will i need to take the gun apart to clean it?
Rick
Uros through an airbrush is perfectly fine. I do it sometimes but if you cross contaminate with enamels watch out!!! You get a goopy mess and all your contaminated paint has to be thrown out. Don’t ask me how I know, oops [D)] I would really suggest having a uro only airbrush.
What are you planning??? just curious.
Just don’t get any thinner into the air valve and you will be fine.
That airbrush has a PTFE (Teflon) needle bearing that is solvent resistant.
Mike
What do you use urethane paints for? I’ve never heard of it being used on models or plastic.
I received a few pints from a local auto paint store for free, I been thinking of doing little art work to one of my riding lawnmowers, 
for practice, or paint something will see, will i need to take the gun apart to clean it?
Ryan,
Some modelers use urethanes on model cars as they produce a beautiful color that no other paints can match.
They are the main paint being used these days in custom automotive paint jobs and airbrushing also.
Rick,
If you spray a lot of lacquer thinner through it when finished then you do not have to take it apart, but it has to be clean or those urethanes will dry inside and that is not pretty. Spray lacquer through it quite a bit, and backflush it also a time or two.
Then spray some more clean thinner through it and it should be fine.
If you want you can take it apart if it makes you feel better knowing it is really clean but it isn’t necessary if you just spray it out good.
I use higher pressure when I spray out also and prefer 50 psi or so, but if your compressor doesn’t go that high then use the highest pressure you can.
Mike
what is backflush? never heard of it .
Rick
Rick,
When you backflush an airbrush you put thinner in the airbrush bottle, hold a rag tightly over the front of the airbrush nozzle, and push down and pull back on the airbrush trigger. This will force thinner back into the airbrush bottle, backflushing it.
If you do this with the metal color cup make sure you don’t spray with the pressure very high as the thinner can splash up out of the cup.
Mike
thanks for all this help, i’ll try backflush next time