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View Nate1's profile

Stopping HVLP Splatter

by Nate1
posted 01-22-2017 05:23 PM


13 replies so far

View Fred Hargis's profile

Fred Hargis

5385 posts in 2796 days


#1 posted 01-22-2017 07:41 PM

Well, you tried everything I would have suggested…have you sprayed other finishes with this gun and not had a problem?

-- Our village hasn't lost it's idiot, he was elected to congress.

View wuddoc's profile

wuddoc

339 posts in 4021 days


#2 posted 01-22-2017 07:43 PM

“Pigmented is a clue”. Gravity affects pigment when it is sitting in a can. Pigment and other solids will settle to the bottom and adhere to each other. Have you completely stirred the material including scrapping the bottom of the can? Stirring round and round is not mixing the various solids in the material. That type of stirring only stratifies the various solids. Here are some stills taken when producing a video years ago.
Picture 1 = Pigment on bottom
Picture 2 = Stirring with stick vertical and round and round does not mix thoroughly various weighted solids.
Picture 3 = Stirring at an angle mixes various weighted solids.

Filtration may help by pouring the material through a filter as you pour it into the guns cup.

-- Wuddoc

View pintodeluxe's profile (online now)

pintodeluxe

5883 posts in 3116 days


#3 posted 01-22-2017 07:47 PM

What psi have you set at the gun? I usually spray at 30-35 psi. If it won’t lay down smoothly, try thinning 15%.

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

View bonesbr549's profile

bonesbr549

1579 posts in 3370 days


#4 posted 01-22-2017 08:08 PM

Have you run it through a viscosity cup and timed it? While the can may say right out of the can, it probably says how much it can be diluted i.e. 10% or something.

When it doubt run it through your viscosity cup and it will tell you. If you getting splatter, sounds like too thick. Cut it and try again.

Also adjust your needle/cap size.

-- Sooner or later Liberals run out of other people's money.

View JAAune's profile

JAAune

1864 posts in 2619 days


#5 posted 01-22-2017 08:17 PM

Someone suggested filtering the material as it goes into the cup. That’s always a good idea.

The other thing to do is check and see if material is getting on the outside of the gun’s nozzle. If it is, it will keep building up until airflow finally knocks off a blob and “spits” it onto your project.

-- See my work at http://remmertstudios.com and http://altaredesign.com

View Nate1's profile

Nate1

20 posts in 2042 days


#6 posted 01-22-2017 08:19 PM

I have not tried spraying other coatings. Water sprays nicely.

Product is mixed thoroughly before spraying. Product does not experience much settling or at least to the level of piling in the bottom of the 1 gallon can. I have used a gallon of this product before…I was amazed at the lack of pigment hanging out when I got to the bottom of it.

30psi. Have tried up and down 10psi with no noticeable improvement.

I am heading out to do some tests thinning it more now.

Have not ran it through a viscosity cup. Do not own one….yet. :-)

I have tried the 1.9mm the manufacturer recommends and a 1.3mm.

Outside of the tip/nozzle is getting boogers. When I stop I clean it off, but no that certainly does not help when spraying and could be the source.

View 000's profile

000

2859 posts in 1202 days


#7 posted 01-22-2017 08:21 PM

In line with what JAAune is saying,
Make sure your nozzle and cap are tight.
Some guns have a clear gasket that goes under the nozzle, is it there?
Are the cap, needle, and nozzle matched #’s?

View Rich's profile

Rich

4156 posts in 892 days


#8 posted 01-22-2017 08:43 PM

I read this right after you posted it, before there were any comments. What JAAune suggested is exactly what I was thinking, but I couldn’t figure out how to express it very well — certainly not as clearly as he did.

Anyway, I second his idea.

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

View AlaskaGuy's profile

AlaskaGuy

5134 posts in 2612 days


#9 posted 01-22-2017 09:35 PM

If that an gravity feed gun make sure the little hole in the top of the cup is clean. According to Jeff at Homestead finishing 90 % of gravity feed gun problems comes from than or a dirty gun.

Look at this advice see if it helps,

http://homesteadfinishingproducts.com/wp-content/uploads/2014/05/paintspraying_ver3.pdf

-- Alaskan's for Global warming!

View Nate1's profile

Nate1

20 posts in 2042 days


#10 posted 01-23-2017 05:48 AM

Splatter issue resolved!

I was able to get rid of the splatter I was getting with both tip/cap/needle assemblies and without thinning. The 1.9mm definitely gave a wider fan of material. Thinning helped out a lot with the 1.3mm in achieving a decently wide fan of material.

Not 100% sure which tactic solved the splatting issue (my guess is the tightening), but I performed the following:

- I ensured the gun was clean inside and out (brand new gun, so not really an issue)
- Added the in cup filter (do not have any pour through filters on hand, so used what I had)
- I tightened the nozzle and cap on tighter than I would expect it to need to be. Previously I did tight with caution to the reality of soft metals are at play in these parts.
- Verified the cup’s vent hole was not clogged. It wasn’t.

Side note: Yes I was setting the pressure regulator while air was flowing through the gun. ☺

Thank you for your help.

Resources
- Spraying paint with HVLP guns: http://homesteadfinishingproducts.com/wp-content/uploads/2014/05/paintspraying_ver3.pdf
- Spitting spray gun: https://www.pittsburghsprayequip.com/2016/02/05/why-your-spray-gun-is-spitting/
- Measuring and adjusting viscosity: http://finishing.tips/measure-and-adjust-the-viscosity/
- HTVLP Troubleshooting: http://www.portlandcompressor.com/hvlp/trouble-shooting.aspx

View Fred Hargis's profile

Fred Hargis

5385 posts in 2796 days


#11 posted 01-23-2017 11:56 AM

Glad you got it solved….

-- Our village hasn't lost it's idiot, he was elected to congress.

View pintodeluxe's profile (online now)

pintodeluxe

5883 posts in 3116 days


#12 posted 01-23-2017 06:13 PM

Nothing quite like a sprayed finish. Glad you resolved the issue.

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

View AlaskaGuy's profile

AlaskaGuy

5134 posts in 2612 days


#13 posted 01-23-2017 06:45 PM

Happy you got it worked out, and thank for posting all the links.

-- Alaskan's for Global warming!

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