How to Set Up & Use a HVLP Pressure Pot Spray Gun

– All right, today we’re gonna be covering how to use a pressure
pot and HVLP spray gun. Principles of using this
system will apply whether it’s HVLP or conventional. There are a couple of
settings that are specific to HVLP that we’ll cover in this tutorial. Pressure pots are a relatively
safe and effective way to spray a variety of coatings. The cleanup is easy as they
have liners that are offered with them, making cleanup an ease. And now all you do is fill
your paint in the pot, secure it down, and then
we’ll go over how to dial it in. To dial a pot in, we start by adjusting the fluid pressure,
which is your left gauge. The second gauge is your air pressure. And we adjust pressure while
holding the trigger on the spray gun until we get a
solid, consistent stream, that’s about 2 to 3 ft in
length with a slight arc. We’ll show you what the
proper adjustment for a stream looks like approximately in a moment here. So that’s about where we
would have our fluid pressure. You can notice it’s a slight
arc, it’s not an extremely fast stream. That’d be right
about where you want to be. On my pot I’m at about
15 lbs of fluid pressure. Typically if you’re above
20 lbs of fluid pressure on your pot, you may want to
consider a larger fluid nozzle, and if you’re much under 10
you might want to consider a smaller fluid nozzle,
as you’re potentially not using the pressure pot
effectively due to too large or too small of a nozzle
on your spray gun. So once you have the
fluid pressure dialed in, next we’ll set the air
spray pressure to get the breakup anatomization that we want. Once we’ve set the fluid
pressure, the next task is to move your air pressure which is controlled by this adjustment here. These open up air to the pot. What you’re looking for
with air pressure you always gotta realize the air
pressure you get to the gun is what shows on the gauge
when you’re triggering. For an HVLP spray gun
like the one we’re using, the cap will have a recommended pressure. In this case, we have a
recommended pressure maximum of 25 psi. What that means
is, by the time the air comes to this gun, the most
air we can have at the base is around 25 psi, before we
do not get the efficiency that we should out of an HVLP spray gun. So when I trigger my gun,
25 lbs is about there. What we’re looking for on
the target is the way it breaks out. If you look
at this surface here, this would be a very
rough orange peel finish, would not give you a
very good quality finish. This is a little dry, but
the breakup is a little finer as you can tell by
the smaller particles. We’ll go ahead and try about
25 lbs of pressure here to see where our breakup is. That looks like a decent finish,
this is a rougher textured coating. It’s meant to coat
booth coating for the walls of a paint booth. If you
wanted to have a finer finish you’d need smaller particles of paint. So you’d either increase
your air pressure or decrease your fluid pressure. If
your fluid pressure is much above below 12 you’d
wanna try and increase your air pressure. If it’s
much above 20 you would consider reducing your fluid pressure. Once you’ve had it set, you
should be able to paint from there until you’re ready to clean up. We’ll show you a little
further what it looks like as a finish here. So you can see by the way
it’s laying on there it’s not heavy, it’s not
thick, it’s not running. Increasing fluid pressure
will give you more paint, decreasing it will reduce it. You can also change the
fluid nozzle to a bigger size to give you more paint. That’s the general principles
of how you dial in a paint pressure pot. We’ll
also move on to how you properly can clean and
reduce solvent waste with the pressure pot. What we can do to reduce
the amount of solvent we use with the paint pressure pot,
is turn off the fluid pressure which is on the left, and
leave your air pressure on, and then we’ll do what’s
called back pressuring the paint pressure pot. You’ll notice both the air and
fluid are open at this point, and then we’ll go ahead and
show you what back pressuring looks like. So what we do is leave the
air on, and we leave the fluid pressure completely turned off. I use a rag and I go ahead
and grab my spray gun, and I push my hand against the air cap. What we’re doing is forcing
the air back through the fluid nozzle and back
through the fluid line to flush out the paint
that’s laying in the line to reduce solvent waste. You’ll notice fluid will flow out of the fluid tube as I do this. Until eventually it will make a bubble, and that’s when you know you
can’t get any more paint out of the fluid line. All right, at that point
we’ve burped out the line, we can then go ahead
and put a clean liner in with solvent and flush this
gun until pure solvent runs out using just the fluid pressure. At that point we know we have
a clear line and a clear gun, we can go ahead remove the air
cap and throw it in solvent, and leave the solvent in
the line, or if you’re using a water-born product, your proper cleaner. And then you’d be able to
leave this pot for the day.

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