A “Rule of Thumb” Method for Adjusting All Automotive Spray Guns


If you’ve ever spent time adjusting a
carburetor you know that there’s a general rule of thumb for each
adjustment screw. Well, a spray gun is not that much different and today I’d like
to go over some general rules for adjusting a spray gun so that you could
be successful with any primer, any paint any sealer, and using any spray gun, no
matter what the instructions say. Every spray gun has basically three
adjustments – a pattern adjustment, fluid adjustment and air pressure adjustment.
At the very top is the pattern adjustment – all the way in one direction
it’s very sharp or pointy – all the way in the other direction it’s a wide pattern –
so if you put it all the way to the pointy pattern you’re gonna have this
and you’re gonna end up probably running the paint. On the other hand if you open
it all the way up you get a wide pattern and your paint job is probably gonna end
up being very dry. So you want it somewhere in between – something like this
or something like this or possibly a little bit wider. So the general rule of
thumb is, too far one way it’s too pointy and you get runs – too far the other way
it’s too wide and you get dry. So you want it somewhere in between so your
paint flows very nicely and you get a nice wet even coat. The next adjustment
knob is the fluid control adjustment knob. If you turn it out you get more
fluid if you turn it in you get less fluid. The only time that I turn it in to
get less fluid is when I’m doing a drop coat with metallics or spraying silver
so that I can do a drop coat or a mist coat – high pressure and low volume so
that the metallics sort of evens out – otherwise, I have it out for
maximum amount of fluid. The last adjustment knob is the air pressure
control knob. The general rule of thumb for air pressure, no matter what paint
you’re spraying, no matter what the instructions say is this: Too much air
pressure and you’re gonna have a lot of overspray and possibly a dry coat – too
little air pressure and you’re not going to be dumping enough paint. You want it
somewhere in between so you’re spraying the most amount of
paint with the least amount of over spray so, again your air pressure should be
somewhere in between so you get the most volume of paint with the least amount of
over spray and that’s what this control knob does. In review, you have a pattern
adjustment, fluid adjustment and air pressure adjustment and it’s very good
to know the general rules for adjusting each of these because every situation is
different and you’re going to have to adjust these on the fly. So I hope you
enjoyed this video on the general rules for adjusting a spray gun and if you did
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One comment

  • Joe Atwork

    Plain and simple. Just the way I like it… Thanks. In the future, could you make a video on buffing out paint? I'm mostly confused about using the woolly bonnets. I've seen some say to use it for cutting and I've seen others use it for buffing wax. Maybe, but I not sure they can do both. Thanks again.

    Reply

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