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Old 07-13-2005, 08:31 PM
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orange peel

I painted my firewall today and ended up with heavy orange peel on the entire area.
I'm using chroma-one single stage. Air pressure at the gun was set to 45 lbs. (HVLP) as stated on the can.
I assume I had my material feed open too much..Is that correct? Or could there be another cause?

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Old 07-13-2005, 09:13 PM
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What gun are your using? what fluid tip size? what temp reducer? what color? does your air compressor keep up with your gun? If it's a metalic you'll have best results mixing catalyzed clear in with the paint 50/50 on the last two coats.
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Old 07-14-2005, 12:58 PM
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I'm using a central pneumatic 43430 with a 1.4mm tip. Mid temp reducer. (Air temp is 85 warming to 100+ by afternoon.) Color is gloss black. I have plenty of air pressure.
I bought this gun mainly to spray primer but i thought if it would spray a decent color coat I would use it to spray the firewall, inner fenders, and cab interior etc.
For the bc/cc on the exterior I will be using professional quality equipment at the local trade tech adult hobby class.
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Old 07-14-2005, 09:01 PM
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Yes I think you'll need to choke down the fluid adjustment and you might also need a slower reducer for them temps. The paint is going on too heavy and not being atomized correctly, your air pressure setting is probably alright or on the high side being an HVLP but I don't have any experience with your model gun. Less fluid will allow the gun to break it up easier but your reducer will need to be the right temp. I sprayed a lot of Chroma One with a basic devilbiss JGA 502 years ago with excellent results, this paint really shouldn't be all that tricky. Your gun adjustment must be off. I've sprayed quite a bit of Chroma One without reducer on chassis parts and smaller pieces and it comes out really nice with durability almost like powdercoating. A Dupont rep clued me in on the no reducer deal. A good friend of mine builds heavy duty truck bumpers and I spray them for him with unreduced C1-they hold up really well with a nice gloss. Bob

Last edited by baddbob; 07-14-2005 at 09:08 PM.
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Old 07-14-2005, 09:13 PM
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The old "Purple" gun.
Good gun, I've been using one for awhile. 1.4 tip set.
You need LOT'S of air with that gun. I run the hose regulator at 80-90 to get the gun regulator just into "the green zone" with the bottom air adjustment knob wide open. Material knob is around 2 turns out depending on material.
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Old 07-14-2005, 11:17 PM
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check this out http://purplesagetradingpost.com/sum...Pspraygun.html
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Old 07-15-2005, 08:01 AM
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Just a thought, but is this "orange peel" REALLY big looking like hills and valleys? It is common to find the interior as well as engine compartment has been exposed to "Armor ALL" type products. Or the oils or fluids found in the engine compartment have "imbedded" themselves in the old paint on the firewall or inner fenders and it gets sanded INTO the paint when sanding.

This "orange peel" is so bad it looks like very large grained leather.

Brian
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Old 07-15-2005, 07:45 PM
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Thanks for the replies.
I used the information in the purple sage link when I originally set up the gun.
My material feed is open 2 1/2 turns or so now, sounds like I just need to turn down a little next time I get some time to paint.
The weather is supposed to cool a bit the first of next week, if you can trust a weather man, perhaps I'll try to paint then.
I don't think oil could be the problem everything was sandblasted to bare metal. It just looks like plain old orange peel.
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Old 07-15-2005, 08:24 PM
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Do this, Use a piece of white "whatever" mounted verticle on something,and hold the gun out away with your hand sideways between the gun and paper then spread your fingers & thumb open like your trying to get someone's attention. "Hey, It's Me, Over Here..."Have your little finger touching the paper and your thumb at the gun nozzel. About 6-7" spread. Hold this position and move your hand down.Pull the trigger to air,then pull full on for 1 second. Adjust your fluid knob till it dosen't run from the cigar shaped pattern. That will get you in the ballpark. Thanks Brian.
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