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Old 01-08-2006, 12:26 PM
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HVLP vs Conventional

I always heard the HVLP are so much better than the conventional
as far as the overspray is concerned, really?
Is it just me?, because I swear that the better high volume HVLP guns
make just as much of a cloud as my old Binks 7.
Unless I use the smaller guns at lower pressures I really don't see a
difference. and those guns just don't spray as fine as the big
cloud makers.

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Old 01-08-2006, 04:34 PM
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Jim... I thought it was just me. It looks to me like there is just as much in the air. The thing that I have noticed, is the fact that I save alot of materials with HVLP. It's like it is just getting better coverage, even though it is getting alot in the air. I even mentioned it to one of the painters I worked with, that it looked like there was alot of materials going to waste. He just told me that he uses alot less materials with the HVLP than the conventional gun that he used to use.

Aaron
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Old 01-08-2006, 05:09 PM
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Thanks Aaron, that's what I kind of thought, it's still making a cloud but
is putting more on while doing it, I guess.
I have an old finishline gun, one of the first ones, and it sprays at 23 psi
and advertises 90% transfer efficiency. I get no clouds with that and
it uses very little air, but the atomization isn't as good and I get more
orange peel with it. I use it for primer and it's great for little jobs.
My astro sprays much better but uses 45 psi (I go 40) and 10 cfm.
It puts out a good cloud but the finish is much better.
I really don't know if that Astro HVLP is any improvement over my
old Binks 7, that I can run at 35-40 psi and get my best finish with.
It seems to me that the old conventional guns still do pretty good,
(without regards to pollution) but I don't have one of the current
really good HVLP's that cost a lot. I wondered if the better HVLP's
would have less of a cloud. Probably not.
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Old 01-08-2006, 05:59 PM
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"I wondered if the better HVLP's
would have less of a cloud. Probably not."

I couldn't say for sure, as I haven't been able to see what it looks like when I am spraying. I do know that the SATA that my buddy uses puts out alot of paint that doesn't go on the project. I have not been able to convince my CFO to allow me to buy one of those yet. LOL

Aaron

Last edited by adtkart; 01-09-2006 at 04:12 AM.
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Old 01-08-2006, 07:11 PM
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I tell you this. If I run my Iwata LPH-400 at the "recommended" 16-18 PSI at the gun shooting clear. It's about half the cloud that my old conventional gravity feed put's out at 45. 'Course I don't run it at the recommended so when I crank the PSI up to 25 or more,It's still less BUT,
The clear TRANSFER to the PANEL is unbelievable.
It's about transfer of material,not the "cloud".
That Lightining graphic panel I did for practice had 2 good coats of 497 Nason on it applied with the LPH and I decided to sand the lightining off,back down to the orginal clear over the base color and redo it. I don't have a mill guage but I started with 320 dry and thought, What the heck, stuck some 220 on the DA dry just to see how long it would take to cut it down. Yeah, It was THAT thick.
Transfer baby,Transfer.
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Old 01-09-2006, 04:56 AM
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I believe you're right, it's all about the transfer.
What I don't understand is how it puts more paint on
the panel without getting more runs.
Do you think maybe it's drying the paint more while spraying
because it's smaller paint particles (with the increased
pressure) so it can build thicker?
I'm just trying to understand this.
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Old 01-09-2006, 07:05 AM
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Me too JC but your probably discussing it with the wrong guy.
OK, How many turns out on the fluid do you open your conv. vs. the HVLP?
Your also wasting more product in the air with conv. and I "usually" have to open it up more to compensate for coverage. Which is the whole HVLP concept.Less is more.
Remember too, Iwata's nozzel design is way different than most other guns as it's actually breaking the paint AT the nozzle where other guns still use just the air cap holes. I'm not trying to turn this into a "it's best" thread,just stating how it works different than other guns. This is what convinced me to get one,especially for clear coat. It really dosen't "paint" as well as my old Finishline. Could be that it's breaking up the paint (thinner) more due to the design. Probably why they came out with the B cap just for paint which they don't recommend using it for clear.
Most of the cheap guns are conv. with a different nozzle/air cap. As I have a few that bit the dust and I actually did some investigating on this thru the weekend. Same gun,but the nozzle and cap are totally different. They won't interchange either,which could just be the gun's manuf. as the air ring "looks" the same in design but different threads, except for the cap which if you look at it,has 4 small holes in a semicircle on each side of the nozzle opening. The conv. has just 2,side by side on each side. I swapped on the HVLP air cap to the conv. and it actually gives a better/wider pattern with some air adjusting. Also seems to break the paint up better. I shot some Nason black with this and it looked a little grainy but after it flashed,was beautiful. I still was running around 45-50 psi but it seemed to do a better job than the original air cap.
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