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Old 03-17-2005, 11:02 AM
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Gravity vs Siphon

I really like my gravity feed HVLP gun until I spray 2k primer.
My primer settles out in it to quickly and if I wait more than
10 min. for the paint to flash my gun won't spray right.
I have a Devilbiss that uses bags so I can lay it on its side
between coats and that works pretty good but my other
guns don't have the bag system feature.
My other guns spray better so I would rather use one of them.
Do the rest of you guys use siphon feed guns for these high solids primers
or is there another trick I don't know about?

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Old 03-17-2005, 02:46 PM
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I use a gravity for high build with no problems.......

But what size tip are you useing?

I use a 2.0 for highbuild.....I bit on the large size I know, but it works very well for me........You should be using a 1.7 or bigger for highbuild though.
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Old 03-17-2005, 02:47 PM
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This really don't sound right, as primer should not settle out that fast.
Some primers have a very short pot life, with a range of 30 minutes at 70 degrees to 2 hours. Are you sure its not starting to set up (gel) on you? That is what it sounds like.
Also, if it is a primer that mixes 4:1:1 with urethane reducer, if you are using a cheap urethane reducer one like omni or nason with a high water content, that can cause havoc.
The water will act as an accelerator.
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Old 03-17-2005, 02:56 PM
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Good point.......

How many coats are your tring to spray, and how long of a flash time are you waiting between coats......

I only spray 2 wet coats.......with a flash time of about 5 to 8 min.......(the stuff flashes quickly)

And it's straight to cleaning my gun.........I don't think I have time for another coat for the same reason that is will "gell" up on me.
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Old 03-18-2005, 06:25 AM
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I really dob't think it's gelling up on me, it really seems more like settling out.
Even in the siphon gun cup I can't keep it mixed enough. I'm going to try a new
primer this season and maybe it will do better. The one I'm using now is
a "MarHyde" product. I know it's a cheap brand but I like the results I get with it. I do have to thin it a lot, like 50%. The stuff is reallty thick.
I used a 2.2 nozzle and a 1.6 and it did about the same.
I use a reducer frow Sherwin Williams that's suppose to be universal.
I usually use a lot slower temp and get better flow, but I have to wait
longer between coats maybe 10 to 15 minutes.
I think I will start putting on less coats after what you guys have said,
More is not always better is it! I was putting on 4 to 5 coats of primer.
I do block a lot of it off with 400 before basing. Thanks guys.
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Old 03-18-2005, 08:20 AM
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Yup, bargain reducer and primer. It is settling down. Sometimes we prime multiple parts. Ya know, have some left, "...hey is that ready...", you get the picture. This happens with K36 after 10-15min in a gravity gun. If the gun has a screw on top, with a rubber glove cover the nozzle and do a couple short blow-backs then shake it a bit. You're right back at it. It's a real problem in the summer.
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