Mini HVLP settings

[black2002ls]

If the weather is good tomorrow, I'm going to try and set up my HVLP touch up gun. It is a CHEAP piece from Harbor Freight, though I know a lot of guys who have had good success with it spraying their model cars.

I will pretty much be shooting clear only with this gun. I typically use Omni 2 part clear.

Recommendations for pressure settings?
Do I need to use a reducer?

[jtotin]

Originally Posted by black2002ls

If the weather is good tomorrow, I'm going to try and set up my HVLP touch up gun. It is a CHEAP piece from Harbor Freight, though I know a lot of guys who have had good success with it spraying their model cars.



I will pretty much be shooting clear only with this gun. I typically use Omni 2 part clear.



Recommendations for pressure settings?

Do I need to use a reducer?

Wich gun? And I think with clear you always use a reducer. Unless it’s like one of those pre-mixed clears that you can get from duplicolor


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[black2002ls]

This gun

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[jtotin]

Originally Posted by black2002ls

This gun

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Really I think it depends on what you’re spraying and if the clear requires a reducer. I don’t think they all do. I haven’t sprayed anything in a long time. I’ve been using the duplicolor pre mixed clear coat. It works pretty well.


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[black2002ls]

I am mistaken. It is not Omni, it is Advantage 545 clear. High solids with a 4.2 VOC

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[black2002ls]

I may be in for an utter disaster. I'm going to test it and see. The nozzle on this gun is a .6, which is interesting since none of the recommendations in the manual are smaller than a 1.0. It recommends a 1.2-1
4 for clear coats with a VOC greater than 3.5.

I get OK results when spraying this clear with my dual action Iwata airbrush. Hopefully this gun is usable and yields better results.

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[black2002ls]

Well, it worked out pretty good. I shot it at the 4:1 mix ratio at 35 PSI









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[bird_dog0347]

maybe it's just the lighting or the camera, but it looks like it was pretty dry and has lots of texture to it. With that small of a tip you might need to go slower to get it wetter, but even then it's gonna be tough.

[black2002ls]

Yeah, there is a lot of texture. I was afraid of it sagging. I started to get the hang of it the more I sprayed. I will have to level it all out and re-spray it. As I slowed my side to side motions, it layed down pretty good.

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[black2002ls]

I currently have the spray pattern set up as wide as it will go (all the way open) and the fan spraying vertically.

I could definitely stand to reduce the spray pattern. How about the orientation and spray top to bottom instead of side to side.

[bird_dog0347]

[black2002ls]

Originally Posted by bird_dog0347

I think I'm right there in the middle. I need to work on slowing my side to side motion down a little

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[bird_dog0347]

With such a fine tip, it might be hard to get more material without just going slower or getting closer but then you can easily get runs.

[black2002ls]

I was spraying pretty close <6" fron the surface I think.

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[projectPONY]

That's a whole lot of air for such a small needle. IMO you should lower your pressure to about 20-25 and continue to reduce pressure from there until you get good flow out. 35psi is more intended for full size guns.

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