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Need help with hvlp spraying

by Robert
posted 07-09-2017 09:23 PM


35 replies so far

View Rich's profile

Rich

4493 posts in 984 days


#1 posted 07-09-2017 09:48 PM


My first venture into hvlp spraying.

I have a Harbor Freight gun.

I need to know 1) what size tip to spray latex and 2) where to buy them

I m under the gun with this project and I m having a real hard time locating sources,

TIA

- rwe2156

For starters, you’re supposed to be behind the gun, not under it :) Sorry, I couldn’t resist. Here's a chart for tip size recommendations for various materials. The metric chart at the top will be most useful, since that’s how most tips are sold.

However, I doubt if tips/nozzles are universal, so finding a suitable set for that gun could be a problem.

-- Knowledge is not skill. Knowledge plus ten thousand times is skill. -- Shinichi Suzuki

View MrUnix's profile

MrUnix

7388 posts in 2593 days


#2 posted 07-10-2017 12:04 AM

I don’t think there are replacement tips for that gun… at least, I’ve never seen any. I do love my purple HVLP gun though, and have shot all sorts of stuff through it. I just thin appropriately.

Cheers,
Brad

-- Brad in FL - In Dog I trust... everything else is questionable

View GR8HUNTER's profile

GR8HUNTER

6108 posts in 1107 days


#3 posted 07-10-2017 12:27 AM

latex is not a very good paint for a gun …...not sure HF has different tips anyways …maybe you can try some floetrol for thinning which it will defiantly take GOOD LUCK :<))

-- Tony---- Reinholds,Pa.------ REMEMBER TO ALWAYS HAVE FUN

View waho6o9's profile

waho6o9

8652 posts in 2971 days


#4 posted 07-10-2017 01:50 AM

I think you need a viscosity cup and make your material empty in a certain amount of time from said cup.

Then you get to spray. Practice on scrap and follow the wet line, thinner coats prevent orange peel.

You’ll do fine after a couple of practice pieces.

Floetrol is a good idea as well.

View Holbs's profile

Holbs

2213 posts in 2424 days


#5 posted 07-10-2017 07:11 AM

My understanding for spraying latex is you need a 5 or more turbine HVLP machine, a 4 turbine could work but needs to be thinned out.
What are you using? A turbine unit or a large air compressor?

-- The Carpenter Bee is derived from the Ancient Greek word wood-cutter "xylokopos/ξυλοκὀπος"

View iamwelty's profile

iamwelty

262 posts in 3510 days


#6 posted 07-10-2017 11:36 AM

I have great results spraying Sherwin Williams Proclassic water based enamel from a cheap Wagner HVLP unit. Thin paint approximately 10% with water. Paint flows out nicely.

-- There is a fine line between eroticism and nausea...

View Bill White's profile

Bill White

5206 posts in 4355 days


#7 posted 07-10-2017 11:43 AM

Flotrol is a “retarder” that allows the paint film to dry more slowly. This give the paint additional time to, guess what, FLOW to a more uniform surface.
The HF gun has a 1.4 needle, and is not the best for latex. Thinning will help a bit, but may not work too well. Try it first before ya go splattering.
The gun does work well for lower viscosity paints and stains.
Bill

-- [email protected]

View rwyoung's profile

rwyoung

412 posts in 3866 days


#8 posted 07-10-2017 01:45 PM



Flotrol is a “retarder” that allows the paint film to dry more slowly. This give the paint additional time to, guess what, FLOW to a more uniform surface.
The HF gun has a 1.4 needle, and is not the best for latex. Thinning will help a bit, but may not work too well. Try it first before ya go splattering.
The gun does work well for lower viscosity paints and stains.
Bill

- Bill White

This.

HF did at one point offer N/N sets through their parts department but I’ve only heard this as rumor, never confirmed and have given away my purple gun as I’ve switched to a turbine system.

So finding their 800 number on the manual or web page is probably the only possibility.

Wouldn’t want to paint a house with one of those guns…

-- Don't sweat the petty things and don't pet the sweaty things.

View Planeman40's profile

Planeman40

1413 posts in 3155 days


#9 posted 07-10-2017 02:03 PM

I just finished spraying a project using a “latex” gel-type paint (Sherwin-Williams) un-thinned using the Harbor Freight gun (which is a good one) and it worked out well. I ran the air pressure up to 50 lbs and it atomized well. The spray pattern was altered back and forth from circular to fan to accommodate various areas of the work. The size of the circular spray was about 5” dia. which is somewhat small but fitted what I was doing. Fan is of course wider. The paint finish on the dried paint was a very fine slightly granular finish as the gel-type paint doesn’t flow much, but it looked great. I will be over spraying with a satin finish clear polyurethane to give a harder finish to take some mild abuse. To my knowledge there are no additional spray nozzles available for that gun.

-- Always remember: It is a mathematical certainty that half the people in this country are below average in intelligence!

View Robert's profile

Robert

3405 posts in 1875 days


#10 posted 07-11-2017 06:53 PM

Thanks Planeman I’m really surprised everything I’ve come across says you absolutely have to thin latex even with a 2.0 tip. One guy uses windshield wiper fluid to thin.

I talked to a painter who came into my business yesterday and he recommended acrylic enamel so I picked up some from SW and will give it a try.

Why can’t I drill it out to 2.0? Back in the day, we used to drill out carburetor jets, right?

-- Everything is a prototype thats why its one of a kind!!

View waho6o9's profile

waho6o9

8652 posts in 2971 days


#11 posted 07-11-2017 07:02 PM

“Why can’t I drill it out to 2.0? Back in the day, we used to drill out carburetor jets, right?”

2 cool

View MrUnix's profile

MrUnix

7388 posts in 2593 days


#12 posted 07-11-2017 07:03 PM

Try it… but I believe you will find that there is a bit more to it than just the size of the hole :)

Cheers,
Brad

-- Brad in FL - In Dog I trust... everything else is questionable

View Rich's profile

Rich

4493 posts in 984 days


#13 posted 07-11-2017 07:22 PM



Try it… but I believe you will find that there is a bit more to it than just the size of the hole :)

Cheers,
Brad

- MrUnix

LOL yeah, that tip won’t fatten up by itself, and you’ll have a big mess on your hands.

-- Knowledge is not skill. Knowledge plus ten thousand times is skill. -- Shinichi Suzuki

View pintodeluxe's profile

pintodeluxe

5936 posts in 3208 days


#14 posted 07-11-2017 07:27 PM

Acrylic enamel sprays great with a 2.0 needle and nozzle set. I am not aware of one that fits your gun. I use the Woodriver HVLP gun with the 2.0 needle and nozzle kit. Thin slightly with water. It lays down like glass.

FWIW, I once tried spraying latex on an exterior door with that HF gun. I had to thin the paint with water. I wouldn’t go that route again.

-- Willie, Washington "If You Choose Not To Decide, You Still Have Made a Choice" - Rush

View CharlesNeil's profile

CharlesNeil

2479 posts in 4265 days


#15 posted 07-11-2017 10:39 PM

I really dont know where to start with this one..but will do my best..might be a couple days
You cant drill out the nozzle because the needle has to match..The Hf gun is not going to spray latex effectively

View Kelly's profile

Kelly

2299 posts in 3339 days


#16 posted 07-11-2017 11:45 PM

1) Latex and HVLP guns get along just fine.

2) You can spray latex with a three stage, but four or more is better. Mine is a four and it does fine, if I thin a quart with about 1/8 to 1/4 cup of water. As mentioned above, a viscosity cup is a good idea to figure out your happy spot for thinning. After that, you can just repeat the mix.

As to drilling your nozzle, the needle and the housing it fits through (just behind the big ring air blows through) are matched. Said another way, that sounds risky and you may end up with a texture sprayer.

View Desert_Woodworker's profile

Desert_Woodworker

1810 posts in 1609 days


#17 posted 07-12-2017 03:44 AM

Thanks CN (Mr. Neil) – I would agree with you in theory; about the tip and nozzle match up, for it to work properly. Since, there are no purple gun, optional 2.0 and 2.5 tip and nozzle, options. I searched and searched and I even, contacted HF- NOGO. I saw on You Tube, where the guy, drilled the nozzle with a 5/64’” drill – I did likewise and with success. (see- my projects; coated with the, purple gun)
How I shoot latex, with the purple gun; nozzle drilled out 5/64”
Clean primed surface
3 coats of “thinned latex” with the proper sanding between coats. This will give you a good base of colored pigment. It will be a flat finish.
Now, topcoat it satin, semi or gloss
Looking forward to hearing more about this topic.

-- Desert_Woodworker

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Desert_Woodworker

1810 posts in 1609 days


#18 posted 07-12-2017 03:52 AM

When diluting your latex or water based finishes- USE distilled water-.

-- Desert_Woodworker

View Rich's profile

Rich

4493 posts in 984 days


#19 posted 07-12-2017 04:06 AM



Looking forward to hearing more about this topic.

- Desert_Woodworker

How about this: Spend an extra $50 on a decent gun that a range of needles and nozzles are available for. Sounds crazy, I know.

-- Knowledge is not skill. Knowledge plus ten thousand times is skill. -- Shinichi Suzuki

View Robert's profile

Robert

3405 posts in 1875 days


#20 posted 07-12-2017 10:40 AM

Looking forward to hearing more about this topic.

- Desert_Woodworker

How about this: Spend an extra $50 on a decent gun that a range of needles and nozzles are available for. Sounds crazy, I know.

- RichTaylor

Thx for all the replies Im looking at other guns now. Someone I read mentioned the Husky gun I think it comes with a couple tips. I changed my mind about the latex and will be am spraying oil based paint.

I got that HF gun for 8 bucks at a tent sale. I’m gonna thin it and give it a try first.

-- Everything is a prototype thats why its one of a kind!!

View Rich's profile

Rich

4493 posts in 984 days


#21 posted 07-12-2017 02:18 PM

Amazon sells several that are inexpensive and include multiple tips. I love my HF HVLP touch-up gun, but I worried about the $15 gun because it doesn’t say HVLP on it. The $30 gun with the regulator does have that molded in its side.

Can anyone clear that up? It seems that every HVLP conversion gun I’ve seen actually says HVLP on it. Is that universal? I remember looking at the Husky kit that contains a HVLP conversion gun and a regular gun. The conversion gun has HVLP molded in, and the regular gun doesn’t.

I know HF specifically says that the inexpensive one is HVLP in their description, but the $30 (Item #62381) gun says HVLP on the gun and the cheaper one doesn’t. I wish I could get a definitive answer.

-- Knowledge is not skill. Knowledge plus ten thousand times is skill. -- Shinichi Suzuki

View CharlesNeil's profile

CharlesNeil

2479 posts in 4265 days


#22 posted 07-12-2017 02:26 PM

If its gravity fed or has a pressurized cup ( bottom) its HVLP

View Rich's profile

Rich

4493 posts in 984 days


#23 posted 07-12-2017 02:43 PM


If its gravity fed or has a pressurized cup ( bottom) its HVLP

- CharlesNeil

I’m still confused though, Charles. The Husky kit in the link below says it contains one HVLP and one standard, yet they are both gravity feed, and otherwise pretty identical, but one of them says HVLP on the frame and the other doesn’t. http://www.homedepot.com/p/Husky-HVLP-and-Standard-Gravity-Feed-Spray-Gun-Kit-HDK00600SG/203497812

It’s not really affecting my life at the moment, since I have all of the turbine/conversion guns I need, but I’m just really curious if it’s universal for the gun to say HVLP on it. All of mine do, and when I saw that HF gun that didn’t, it made me wonder.

-- Knowledge is not skill. Knowledge plus ten thousand times is skill. -- Shinichi Suzuki

View 000's profile

000

2859 posts in 1294 days


#24 posted 07-12-2017 02:51 PM


The Husky kit in the link below says it contains one HVLP and one standard, yet they are both gravity feed, and otherwise pretty identical, but one of them says HVLP on the frame and the other doesn t.

- RichTaylor

The one that doesn’t say HVLP is the standard.. :>/

View Rich's profile

Rich

4493 posts in 984 days


#25 posted 07-12-2017 02:55 PM


The Husky kit in the link below says it contains one HVLP and one standard, yet they are both gravity feed, and otherwise pretty identical, but one of them says HVLP on the frame and the other doesn t.

- RichTaylor

The one that doesn t say HVLP is the standard.. :>/

- jbay

That’s my point though, jbay. I understood that, and am asking if that is universal — if the gun doesn’t say HVLP on the side (like the cheaper of the HF guns) does that mean it’s not HVLP, even though the description of it on HF says it is?

-- Knowledge is not skill. Knowledge plus ten thousand times is skill. -- Shinichi Suzuki

View Kelly's profile

Kelly

2299 posts in 3339 days


#26 posted 07-12-2017 03:00 PM

Just so you know, back before HVLP’s were common, I had a bunch of Devilvis and Binks guns that were not HVLP’s and met the description you gave. They used around forty-five pounds per inch of pressure to operate.

Of course, HVLP (high volume, low pressure) is about low pressure. Say, around seven to ten pounds, versus the usual, approximately, forty-five PSI.

If you can get an on line manual on a gun, it should say what the tip pressure is, if it is a conversion gun, or if it is a true HVLP gun (which will take an air hose several times larger than a standard gun). Obviously, any of those things will give you the info you need to determine the type of gun.


If its gravity fed or has a pressurized cup ( bottom) its HVLP

- CharlesNeil


View 000's profile

000

2859 posts in 1294 days


#27 posted 07-12-2017 03:01 PM

I’m just busting your B’lls.

Don’t know if it’s universal, but I would imagine if it’s HVLP they would put it on the gun just for marketing.
I can’t think of any guns I have seen that are HVLP and didn’t have it on them.

View Kelly's profile

Kelly

2299 posts in 3339 days


#28 posted 07-12-2017 03:29 PM

Since I had my turbine system out to do some texture work, my gun was sitting on a cabinet waiting for it to come back home. I went out and checked and nowhere on that gun does it say HVLP. It says only Capspray. Of course, the air connector on it is a dead give away as to its type.

Conversion guns are, of course, not so easy to judge by their connectors, since they rely on compressors, rather than turbines.

It does seem like they’d print HVLP on the gun, since companies usually want to take every opportunity to promote their product any way they can.

View Rich's profile

Rich

4493 posts in 984 days


#29 posted 07-12-2017 03:42 PM



I m just busting your B lls.

- jbay

Turnabout is fair play. I certainly deserve it. :)

-- Knowledge is not skill. Knowledge plus ten thousand times is skill. -- Shinichi Suzuki

View CharlesNeil's profile

CharlesNeil

2479 posts in 4265 days


#30 posted 07-12-2017 03:46 PM

the thing that makes a HVLP .. it that is doesnt require alot of pressure to create a siphon, to draw the fluid up, the earliest was the gravity fed.. and remains a staple to this day , then they figured if they pressurized the cup to push the fluid to the nozzle, they got the same thing ..
Just how it works

View Robert's profile

Robert

3405 posts in 1875 days


#31 posted 07-12-2017 05:09 PM


If its gravity fed or has a pressurized cup ( bottom) its HVLP

- CharlesNeil

Thanks Charles. The gun has a 1.4 tip. The guy at the SW store seemed knowledgeable he said thin if 1:10. Sorry I can’t remember the exact name of the paint but one is oil based primer the other is oil based enamel. Does this sound right to you?

On another aspect, this is for a bathroom vanity the clientr wants a satin finish. I suggested semi gloss. What’s your opinion?

-- Everything is a prototype thats why its one of a kind!!

View pintodeluxe's profile

pintodeluxe

5936 posts in 3208 days


#32 posted 07-12-2017 05:23 PM

Satin or semi-gloss would be appropriate for a humid bathroom environment. I prefer satin if it’s available.

-- Willie, Washington "If You Choose Not To Decide, You Still Have Made a Choice" - Rush

View Desert_Woodworker's profile

Desert_Woodworker

1810 posts in 1609 days


#33 posted 07-12-2017 05:57 PM

May I suggest, that you practice with water based products, so that clean-up will be easier. Again you are practicing with various viscosities. Sorry but there is a learning curve.
1.4 which is standard for the purple gun- requires thinning of thick products and the recomended tip is 2.0 – 2.5 which you cannot get for this gun. To save you costly failures, I suggest that you experiment with 1-10 thinning as was recommended to you and see if it works; this ratio never worked for me. For finishes like you describe Titon Cap spray (sold at SW) Also the Idaho painter has some really informative YT videos
https://www.youtube.com/watch?v=fPLX0tZNWbc&ab_channel=HomeImprovementHowTo%27s

Looking forward to hearing more about this topic.

- Desert_Woodworker

How about this: Spend an extra $50 on a decent gun that a range of needles and nozzles are available for. Sounds crazy, I know.

- RichTaylor


you may want to purchase a better system as suggested…...

-- Desert_Woodworker

View MrUnix's profile

MrUnix

7388 posts in 2593 days


#34 posted 07-12-2017 08:05 PM

I use one of those purple HF guns to spray mostly oil based enamel, and it works great – much better than I originally expected when I first bought the thing, and is really easy to clean as well. Yes, you will need to thin – how much depends on the paint you are using. I’ve got some Sherwin Williams industrial enamel that seems a lot thicker than most I’ve used, so it needs to be thinned a bit more than usual… maybe 70/30 or so with Mineral spirits. One odd-duck is rustoleum, which says to thin with Acetone, but it works and shoots really nice as well.

Cheers,
Brad

-- Brad in FL - In Dog I trust... everything else is questionable

View Robert's profile

Robert

3405 posts in 1875 days


#35 posted 07-31-2017 05:39 PM

I’m using SW Pro Classic oil based enamel.

I thinned about 10:1 and tried a test it was spitting at first and about the time I got it close I ran out of paint.

I’m running around 25 psi.

So how thick should the be going on?

Should it cover in one pass?

-- Everything is a prototype thats why its one of a kind!!

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