Low overspray gun

Alan8n · Jan 7, 2020

Will be painting my 52 8n shortly and have a question on paint guns. I have done 2 project tractors with my Devilbiss PLUS gun, which is described as an hvlp gun without the cfm requirements (around 9cfm) of a true hvlp gun, and am happy with the results except for one thing, overspray. I thought an hvlp gun overspray should be less but using my gun it seems I get a lot of overspray. I have set it up correctly and have checked psi to make sure it is within the guns specs.
I have seen the videos of hvlp systems that have their own compressor and they seem to have little to no overspray, but that is NOT what I see with my gun. I must admit I have not used any other gun so i really don't know if what I am seeing is normal or not.
Obviously if you have an unlimited budget, or are a professional painter and have a paint booth etc then overspray is not that big of a concern. I was looking for opinions on what would be a good gun for a regular hobby guy that has as little overspray as possible.
Thanks ...any opinions welcome
Alan
p.s. I do use a fresh air respirator !

Welding man · Jan 7, 2020

I do a lot of painting and have for a lot of years but I am not an expert by any means. I have sprayed a lot of regular enamel, acrylic enamel and base clear. There is a fine line between dry spray, overspray and a big run. I never get dry spray or over spray and I always get a good shine but occasionally do get a little run, which I can take care of pretty easy. I have owned a lot of paint guns, different brands and types. I am now using a Devilbis Finishline and am very happy with it. If I ever save enough pennies I will buy a SATA. Painting is a lot like welding, it takes a lot of practice. I have a friend that painted on the assembly line at Chrysler years ago, before robots. He paints with a junky old paint gun he's had for 40 years and he can lay down a paint job you can't believe. It's not all in the gun.

kencombs · Jan 7, 2020

I can't see the overspray from here! but the Plus is not an HVLP gun, almost but not quite. It is supposed to have HVLP transfer efficiency though. So, if your input pressure is at spec and the gun to work is correct, you shouldn't have a lot of overspray. But, any time you spray you get some.

I think the transfer efficiency target for HVLP (and Plus) is 65%. in other words, 35% of the paint is in the air, not on the work.

The HVLP units that use a turbine are a different animal altogether. Very low pressure, and because of the turbine the air is warm which can cause issues.

I had one. Sold it. Lots of people like them. Not me. I just couldn't get used to the huge air hose and warm air. Clumsy to handle and at the time I was using lacquer, and got a lot of dry spray

Butch(OH) · Jan 8, 2020

What Ken and Welding man said x2. I would
add that all guns have some over spray.
What is bad is when it or the previous
coverage is so dry that it doesnt melt
into the previously painted surface.
Your speed and the speed of your
componants has a great affect and you do
need to plan your work plus you need some
air movement. If you notice on the videos
the pros are pretty darn fast, what you
can't see is they are also using
hardeners and reducers on the fast side
of the window for the temps. As Welding
man said you balance your technique and
components between laying a good coat and
not having runs nor dry overspray issues.

Low overspray gun

Alan8n

Member

Welding man

Well-known Member

kencombs

Well-known Member

Butch(OH)

Well-known Member

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