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Need help with hvlp spraying

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Forum topic by rwe2156 posted 07-09-2017 09:23 PM 1182 views 1 time favorited 35 replies Add to Favorites Watch
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rwe2156

3069 posts in 1597 days


07-09-2017 09:23 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

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


35 replies so far

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Rich

3524 posts in 705 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.

-- Half of what we read or hear about finishing is right. We just don’t know which half! — Bob Flexner

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MrUnix

6884 posts in 2315 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

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GR8HUNTER

4547 posts in 828 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

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waho6o9

8350 posts in 2693 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.

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Holbs

1930 posts in 2145 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

View iamwelty's profile

iamwelty

259 posts in 3232 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

5048 posts in 4076 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

-- bill@magraphics.us

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rwyoung

409 posts in 3588 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

1239 posts in 2877 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 rwe2156's profile

rwe2156

3069 posts in 1597 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!!

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waho6o9

8350 posts in 2693 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

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MrUnix

6884 posts in 2315 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

3524 posts in 705 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.

-- Half of what we read or hear about finishing is right. We just don’t know which half! — Bob Flexner

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pintodeluxe

5739 posts in 2929 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

2434 posts in 3987 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

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