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Old 06-15-2007, 12:50 PM   #1
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Spray Painting


I would like to know if a spray gun, the type used for painting a car, would work with latex interior/exterior paints? I would like to paint my mailbox and other small jobs such a enterior louvered doors. I have a compressor and didn't know if this would work given the thickness of latex paint.
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Old 06-15-2007, 01:34 PM   #2
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Spray Painting


That depends on what type of spray unit it is
Is that an HVLP unit?
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Old 06-15-2007, 01:56 PM   #3
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Spray Painting


What is HVLP?
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Old 06-15-2007, 02:04 PM   #4
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High Volume Low Pressure
That would be what most would be painting their car with
It can also be use for trim, shutter, doors, stuff like that

They usually have their own compressor, or rather more of a turbine

If it's a cup sprayer you have, and it's attached to a compressor that you use for air tools and such, I wouldn't recommend it for latex
It's technically do-able, but the pressure is so high up to 70% of the paint goes into the air
Not a real smooth finish either
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Old 06-16-2007, 11:19 PM   #5
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Spray Painting


I would think that the cup sprayer with the air compressor would work, the thing is that you might have to thin it down a bit. Most acrilic waterborn "latex" is thick.
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Old 06-16-2007, 11:20 PM   #6
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Spray Painting


Sorry, i also ment to add if your only doing small projects like the mailbox, you could also consider an airbrush.
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Old 06-17-2007, 07:39 AM   #7
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Spray Painting


Quote:
Originally Posted by Workaholic View Post
I would think that the cup sprayer with the air compressor would work...
You'd think....
I just want to tell everyone from personal experience, don't do it

Technically, it works...the paint can get out of the sprayer
In reality, it does so horribly badly for a bad finish and with up to 70% of the paint in the air not on the surface...it's just a bad thing

Like Nancy Reagan used to say:
Just Say No
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Old 06-17-2007, 10:48 AM   #8
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Spray Painting


I'ver attached a link for a spray gun and am wondering if this will work with my 6 gal. Porter Cable pancake compresser? I'm wondering if the compressor's CFM which is 3.7 @ 40psi and 2.6 @ 90psi, will work okay with this gun which requires 11 to 13 CFM @45-70psi. Anyone's thoughts?


http://www.harborfreight.com/cpi/cta...emnumber=92841
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Old 06-17-2007, 01:03 PM   #9
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Spray Painting


Quote:
Originally Posted by slickshift View Post
You'd think....
I just want to tell everyone from personal experience, don't do it

Technically, it works...the paint can get out of the sprayer
In reality, it does so horribly badly for a bad finish and with up to 70% of the paint in the air not on the surface...it's just a bad thing

Like Nancy Reagan used to say:
Just Say No
Well i haver never used a cup on a compressor, but i have used a graco hlvp, it would spray oil decent enough, but in no way could it choak down latex. You had to thin the product a lot. Which is how i think of a cup on a compressor. Actually i pictured a cup with compressor doing a bit better than that hvlp.
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Old 06-17-2007, 03:20 PM   #10
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Spray Painting


Quote:
Originally Posted by joe3534 View Post
I'ver attached a link for a spray gun and am wondering if this will work with my 6 gal. Porter Cable pancake compresser? I'm wondering if the compressor's CFM which is 3.7 @ 40psi and 2.6 @ 90psi, will work okay with this gun which requires 11 to 13 CFM @45-70psi. Anyone's thoughts?


http://www.harborfreight.com/cpi/cta...emnumber=92841

That's not a HVLP rig...
I'm sorry, anything you hook up to your compressor is the wrong type of sprayer for what you need
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Old 06-17-2007, 03:24 PM   #11
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Spray Painting


Quote:
Originally Posted by Workaholic View Post
...a graco hlvp, it would spray oil decent enough, but in no way could it choak down latex. You had to thin the product a lot....
Correct
Not an ideal situation as the latex must be thinned tremendously

The best way to spray latex is an airless

For a louver door and mailbox, my next choice would be...well, by hand
Frankly, it would take less time to do them by hand than it would to set-up, mask off, clean-up, and break-down a spray rig
But my next choice for a sprayer would be a HVLP with the latex super thinned
A cup sprayer on a compressor would not be on my list
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Old 06-18-2007, 04:05 PM   #12
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Spray Painting


Yeah i would just run an airless rig as well, so i guess the next step then is to do them by hand or go rent an airless from HD. I take Slicks word that a compressor will be worse than the hvlp.
I truly dislike that Hvlp that we had, we ran oil back then and even that was a pain.
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Old 06-26-2007, 09:29 PM   #13
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Spray Painting


We just experimented with two automotive guns, one was a cup gun and the other was gravity feed. We used them on a new fireplace mantel.

Of the two the gravity feed was better but overall the finish from both was unacceptable, too dry and textured for our liking.

So out came my ol' "beat to death" airless and, presto, a perfect finish.
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Old 07-02-2007, 02:43 AM   #14
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Spray Painting


Joe, if you are painting your mailbox and a couple louver doors in your house you will do just fine with that cheapo harbor freight cup gun.

You will need to thin out the paint quite a bit.
more than recommended on the product can...
but that's ok, it's your house !

Your compressor is small, so you will not be able to spray continuous.
Spray a bit, then let the compressor catch up. Do it again.
After a couple times of that, make sure that it's not overheating.

Do the mailbox first. great practice !
If you don't like it, take it off and blast the paint off at the carwash.
Then you can try again.
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