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Old 06-22-2007, 02:08 AM
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Orange peel

I'm sure this has been asked before, but what causes "Orange Peel" ???

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Old 06-22-2007, 04:10 AM
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The final finish of any paint job is related to

1) Speed of travel over the surface by the spray gun.
2) Correct spraying distance.
3) Correct paint/thinners mixture.
4) Correct air pressure.

Even the best painter will have some kind of defect, such as "Orange Peel" that is why some colour sanding, or Clear Coat flatting is carried out after hardening of the surface, before final polishing.

All the things I have listed above are inter-related, if the spraying distance is correct, but the speed of the gun is too slow, you will get Orange Peel.
Inversely, if the Speed is correct, but the distance of the gun to the surface is too close, you will get Orange Peel.

I have no doubt there will be other answers which go into technicalities about atomization, quality of guns, size of compressors etc, but we can't all afford to spend $thousands on one paint job, so we have to make the best of whatever equipment we have.

With a little practise, and attention to what is going down on the panel, we can make a good job of it. Everyone gets a run or two, or a little Orange Peel, and if we dont clean the panel properly, we get Fisheyes and several other defects. So think first, prepare the job properly, and take your time.
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Old 06-22-2007, 07:34 AM
 
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Putting on excessive amount of material is usually the number one cause. Air pressure is a cause, but I'll argue that one. Example: doing door jams, I don't blast the jams with full air pressure, I trim it down and trim down the material knob. Also pick the slowest hardner that you can get away with. Give it more time to level itself out.
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Old 06-22-2007, 11:23 AM
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Insufficient volume of paint will cause orange peel. If there isn't enough paint, it won't flow the way it should. Too much paint causes sags and runs, not orange peel.

Chris
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Old 06-22-2007, 08:21 PM
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Like mosstrooper said, those variables and others need to be where they are suppose to be. If they way out of the ballpark, you'll get orange peel or runs.
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Old 06-22-2007, 11:11 PM
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Well, I must have "Lucked Out" tonight. We'll call it beginners "Luck" First time I sprayed anything with something other than a rattle can. I just guessed at the volume adjustment , 3 full turns out , set the air pressure about 45-50 psi , checked the fan pattern for a cigar shape and sprayed the underside of my hood. Looks Pretty Dam Good !!! We'll See if it still Looks Good tomorrow.
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Old 06-25-2007, 06:21 AM
 
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then explain why a 1.5 or 1.7 tip will give you more peal than a 1.3
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Old 06-25-2007, 06:50 AM
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Orange peel, in general terms, is too much fluid improperly atomized at the tip of the gun. Too much fluid for a given air pressure and volume means big droplets and thick paint film which won't flow out no matter how slow the reducer, or activator. The air pressure from the gun makes it worse because it moves the paint film around before it flashes, much like holding your air gun over a bucket of water and watch the ripples. A good example that was given to me several years ago, and it's a good one is: If you wanted to cover the floor of your shop, it would be easier if you did not use basketballs..........BB's would work better and much smoother.
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