fengda airbrush question?

[Guest]

Dr. Strangebrush, who is a chemist, did some testing with various cleaners. Personally I use alcohol, followed up with a quick squirt of Tamiya Extra Thin Cement/Airbrush Cleaner if I’ve been spraying acrylics. I find if I just use alcohol it tends to dry out the airbrush.

By the way, if you’re going to use a mix with Windex and it has ammonia don’t let it sit on your brush. Flush it out with something else afterwards - the ammonia will attack the nickel plating If it’s given time to work.

Cleaner test

[Guest]

That's good to know thanks.
I will test it once I have made a booth, and tested the brushes.

just a thought...
can I change the needles on this brush OK?

Sorry, I didn’t receive a notification for your reply.

The airbrush in the kit you posted originally? It appears to come with three needles (and nozzles and caps which must be swapped as well). Just be careful, as nozzle threads are easily stripped. I prefer to have two different airbrushes instead - once you get into swapping out those parts regularly the guns just stop working properly after a while.

[langy71]

have a ganders at this video, it may help

[Modler bob]

Added to favorites, thanks Chris.

[Andy T]

Added to favorites, thanks Chris.

Rob (Dredfx) has some great beginner exercise videos too. He's much more artwork than scale models (although we've tried to convince him to do one :smiling2: ) but it's all good practice for trigger control.

[adt70hk]

I find the smileys only work when you use the icon button at the top of the text window…….those on the keyboard itself don’t work for some reason.

Same here....

[Modler bob]

I'm back lol.
Although I haven't got it set up to paint yet, I thought I'd just test it in case I have to send it back to Amazon.
It works a treat except when I try to pull the air release with the Oring, It's very difficult to pull out (Is this a WD40 job?)
Also, the air pressure knob that one turns is very stiff.
Got any advice please guys?

[Jim R]

The air release O ring is supposed to be stiff. It has to have a powerful spring to prevent releasing air when compressor is working. I think it is good practice to release the pressure at the end of a session using the drain plug at the bottom of the tank. Easier than the O ring and more importantly it drains any moisture in the tank. I leave the plug out until the next time I use it.
The pressure selector could just be stiff as it's new. Does it pull out to turn and push in to lock?

[Modler bob]

Thanks. I see the point you're making, but although I'm an old git, I still have strength in my right hand
And in one of the videos I looked at it was pulled out with the guy's finger
my thinking is ...If it's this hard to move manually how is it supposed to work normally?

ah yes the pressure selector is now working, I just kept trying :smiling2:
Many thanks for your input Jim

[Modler bob]

Just thinking again Jim.
I was thinking it was an auto-release valve in case there was too much air in the tank, but I guess not..right?

[Andy T]

The one with the metal O ring is generally a safety valve and should be left well alone. Some do release the pressure from there but you shouldn't really.

Better to use the drain tap / screw underneath as Jim says

[Modler bob]

The one with the metal O ring is generally a safety valve and should be left well alone. Some do release the pressure from there but you shouldn't really.

Better to use the drain tap / screw underneath as Jim says

Cheers andy.
At what pressure does it open then?

[Tim Marlow]

Cheers andy.
At what pressure does it open then?

Hi Bob. It will be set above maximum compressor working pressure, but well below tank safety test pressure. It will be there to protect the tank against malfunction of the compressor limit switch (leading to the tank being overpressurised) and should be factory set, so leave well alone. If it is continually disturbed the valve seat can become damaged leading to weeping and an inefficient seal. As Andy says, drain air from the tank using it drain tap. It’s what it’s there for

[Andy T]

Cheers andy.
At what pressure does it open then?

Technical answer - bloomin' lots :smiling5:

If it ever blows, don't hang around to find out as it means something is seriously wrong!

[Tim Marlow]

Technical answer - bloomin' lots :smiling5:

If it ever blows, don't hang around to find out as it means something is seriously wrong!

Usually about 25 % of maximum tank pressure Andy….and that itself is usually a very conservative value
Don’t panic, just pull the power and you’ll be fine……the overpressure relief valve (ORV, safety valve) is supposed to be sized to bleed enough air out to prevent overpressurisation from attached kit like compressors. The higher the overpressurisation the wider it opens and the more air it lets out.