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HVLP or not

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Geoff Gauger

03-05-2002 14:42:01

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I've been shooting Case IH 2150 enamel for years with wonderful results. I use a $60 Craftsman cup gun. I'm looking to buy a new gun and am considering HVLP. Any comments / suggestions.

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Clooney

03-06-2002 15:43:23

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Re: HVLP or not in reply to Geoff Gauger, 03-05-2002 14:42:01

Geoff, I was in the same position you are about a year ago. After doing research, talking to some of my pro-painter friends & trying a couple HVLP guns (thanks to my painting pals) I decided to get a conventional gravity feed gun.
~I have been painting for about 30 years & have become quite proficient with conventional spray equipment but have to admit I kind of mix by feel & don't always use the same reducer or thinner recommended.
~Here is what I found out, was told & kind of found..... If you are an experienced painter that has a good high CFM compressor & uses a lot of very expensive paints a HVLP gun is right for you, will save money & with practice will produce a good paint job (most professional painters use the HVLP now).....If you are like me & use lower cost materials, don't paint for a living, don't paint enough for material cost to be a big factor & don't follow the mixing directions to a T, a quality conventional gravity feed gun is probably a better way to go. If you get a "compliant" conventional gravity feed gun the paint saving will be better & the painting results will be fantastic, the air caps on the new conventional guns are made to meet stricter standards & break the paint up pretty fine so a quality paint job is fairly easy. I haven't once believed I made the wrong decision & due to the much wider spray pattern on the new gun, excellent air & fluid control & easy clean-up due to a plastic bag in the paint cup, I have been very pleased.

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Rod (NH)

03-06-2002 20:28:29

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Re: Re: HVLP or not in reply to Clooney, 03-06-2002 15:43:23

Hi Clooney,

Everything seems to be going gravity feed now-a-days. My guess is that the "compliant" stuff, having a maximum cap air pressure requirement of 10 psig, causes the fluid passage velocities in the gun to be lower and therefore causes it to be less effective for any type of venturi suction feed, especially for the heavier materials...thereby essentially forcing a gravity feed arrangement. I must be in the minority as I love the remote pressure pot feed, having grown quite accustomed to it...no weight of paint in my gun hand and truly all-position spraying. I was told today though by a guy who sells the stuff that if I tried gravity feed HVLP I would never go back...but then again the same guy also told me I could spray upside down with a gravity gun! What is your experience on possible gun positions with the gravity feed? And can you lay the gun down on its' side with paint remaining in that silly looking gravity cup (no offense intended :o))? Somehow I distrust the statement that I could spray upside down. Neither water nor paint flows uphill by gravity alone. I may be missing something here though.

Rod

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Thanks Guys

03-07-2002 19:31:37

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Re: Re: Re: HVLP or not in reply to Rod (NH), 03-06-2002 20:28:29

Now that I know about the baggies, everything makes sense.

Rod

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Cliff Neubauer

03-07-2002 16:49:31

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Re: Re: Re: HVLP or not in reply to Rod (NH), 03-06-2002 20:28:29

I too thought the gravity feed gun would be acward to use but that goes away after you use one for a few minutes. I also use the Devilbliss cup liners in my Sharp, they cost about $25 for 48 liners but they are nice to use. Even without the liners you can hold the gun sideways without spilling. To me the nicest thing about the gravity feed guns is not having to throw out perfectly good paint just because a siphon gun can't clean out the cup. HVLP guns have to have 10 psi or less at the cap, I think the compliant guns just need a 65% or better transfer effiecency regardless of the cap pressure.

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Clooney

03-07-2002 03:59:30

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Re: Re: Re: HVLP or not in reply to Rod (NH), 03-06-2002 20:28:29

Rod, the gun I have is a gravity feed "Devilbiss GFG pro" & that partecular gun uses the plastic baggie system in the paint cup (If desired, it will paint without it, but the baggie is needed for upside down painting & makes cleanup very easy)
~The baggie system allows only paint to sucked in (even upside down) & works on the same principle as a baggie type baby bottle that only allows the baby to suck fluid & not air. This system works great & I have better luck painting upside down with the GFG than my old suction gun. Due to the sealed bag there is no open vent hole to ever leak or drip. ~The bags aren�t the cheapest if you do a lot of touch up type painting with many small loads but I have found conventional little sandwich bags work great for small projects such as touch up & small repairs, I still use the better heavier Devilbiss bags for major or important jobs .
~I have also found that the use of the bags has probably saved the cost of the gun in the last year by using much less thinner to clean the gun when finished. I probably only use 3-4 ounces to clean the gun now.
~I never thought of a �compliant� gun only having 10 psi at the cap but that must be true to be compliant, there must be a low setting or some different adjustment to get the �compliant� setting or rating as my cap pressure is much higher than that in actual use & the gun paints much like my old suction feed only with a much better & wider pattern.

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Geoff Gauger

03-06-2002 18:48:51

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Re: Re: HVLP or not in reply to Clooney, 03-06-2002 15:43:23

Thanks for the input guys. I'm sticking with conventional (for starters my compressor won't handle the required CFM for HVLP)

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Rod (NH)

03-06-2002 10:20:00

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Re: HVLP or not in reply to Geoff Gauger, 03-05-2002 14:42:01

Here's an interesting write-up from Sharp. I'm a pressure feed kind of guy and definitely not yet ready to blow $400+ on a DeVilbiss pressure feed hlvp gun!

Switch To HVLP?

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Cliff Neubauer

03-06-2002 06:36:56

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Re: HVLP or not in reply to Geoff Gauger, 03-05-2002 14:42:01

I've heard mixed results on the cheaper off brand HVLP guns. I can say that the better ($150+) brand name guns will do an exelent job, even with high solids clear coats which are difficult to atomize. Also HVLP guns tend to need more air so make sure your air compressor is up to the job.

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Paul

03-05-2002 16:29:58

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Re: HVLP or not in reply to Geoff Gauger, 03-05-2002 14:42:01

I've never used a HVLP but have been told there not as good as a regular paint gun.I use a devilbus on 2150 and it works fine

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