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Need help with HVLP gun

 
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rvator(at)lindonnet.com
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PostPosted: Wed Jan 11, 2006 4:10 pm    Post subject: Need help with HVLP gun Reply with quote


I got a new HVLP gun (Alltrade from Costco) and attempted to use it this
weekend to prime some parts for my ailerons. Unfortunately, I could not get
a good spray pattern out of it. It seemed no matter what I tried, it would
only spray a very week, splattery pattern - the paint did not atomize very
well at all. I'm using AFS water-based primer, BTW. Pressure was at 40
psi, then increased to 45 (the gun says use max of 43). I did not thin the
primer because I've had good luck spraying it straight out of the bottle in
the past with my high-pressure touch-up gun. I ended up finishing the job
with my old gun, which does a good job, but I was hoping to significantly
reduce the overspray and amount of paint vapor in the air (and wasted
paint).
The little pamphlet that came with the gun was of little help; I tried its
recommendations for changing the flow and pressure. Anybody here have
experience with a top-feed HVLP gun that could give me some pointers?
Thanks much,
Bob Smith


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Bret Smith



Joined: 09 Jan 2006
Posts: 178
Location: Mineral Bluff, GA

PostPosted: Wed Jan 11, 2006 6:52 pm    Post subject: Need help with HVLP gun Reply with quote


Bob, you will need to thin the primer or get a different nozzle that has a
larger orifice.
Bret Smith
Mineral Bluff, GA
www.FlightInnovations.com
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Daniel.Snow(at)wancdf.com
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PostPosted: Thu Jan 12, 2006 5:17 am    Post subject: Need help with HVLP gun Reply with quote

Bob, I have a similar setup and called AFS when I had the same problem. They instructed me to do two very important things: 1) Increase air pressure such that you maintain the required air pressure at the gun with the trigger pulled continuously. That may mean turning the pressure up to 50-60 psi at the tank.
2) Thin, thin, thin. I don't have a viscosity cup, so the guy at AFS told me to thin it up to about 2 parts paint to 1 part water.

Of course you probably already know to just barely fog the pieces with the first pass, wait 3-5 minutes and lightly spray in the perpendicular direction, wait 3-5 minutes and lightly spray, etc.

I don't have the numbers here at work, so I suggest you call AFS. The owner is very friendly and willing to spend time explaining how to use his products.

Good luck.

Daniel Snow
RV-9A wings finished, waiting for slow-build fuse
Jacksonville, AL

Time: 04:10:54 PM PST US
From: "Bob Smith" <rvator(at)lindonnet.com>
Subject: Need help with HVLP gun



I got a new HVLP gun (Alltrade from Costco) and attempted to use it this
weekend to prime some parts for my ailerons. Unfortunately, I could not get
a good spray pattern out of it. It seemed no matter what I tried, it would
only spray a very week, splattery pattern - the paint did not atomize very
well at all. I'm using AFS water-based primer, BTW. Pressure was at 40
psi, then increased to 45 (the gun says use max of 43). I did not thin the
primer because I've had good luck spraying it straight out of the bottle in
the past with my high-pressure touch-up gun. I ended up finishing the job
with my old gun, which does a good job, but I was hoping to significantly
reduce the overspray and amount of paint vapor in the air (and wasted
paint).

The little pamphlet that came with the gun was of little help; I tried its
recommendations for changing the flow and pressure. Anybody here have
experience with a top-feed HVLP gun that could give me some pointers?

Thanks much,

Bob Smith


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LarryRosen



Joined: 16 Jan 2006
Posts: 415
Location: Medford, NJ

PostPosted: Mon Jan 16, 2006 8:43 am    Post subject: Need help with HVLP gun Reply with quote

Here
<http://purplesagetradingpost.com/sumner/techinfo/HVLPspraygun.html> is
a link to some HPLV spray gun set up tips. It is for Harbor Freight
HPLV spray guns, but it may help.

Larry Rosen
RV-10 #40356
<http://lrosen.nerv10.com>


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#40356
N205EN (reserved)
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