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Antique Tractor Paint and Bodywork

poxy primerOrange peel E

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DD MI.

12-02-2006 14:48:50




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Help freinds. I am spraying ppg epoxy primer on clean bare metal. It's coming out orange peel. I'm using a hvlp gun. Primer is fresh and just opened. I also ran some top coat and that runs smooth from same gun. two dif. cans same thing.thanks




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DD MI.

12-02-2006 18:49:47




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 Re: poxy primerOrange peel E in reply to DD MI., 12-02-2006 14:48:50  
thanks guys I'll check my tip for size and try the old gun next time.



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CNKS

12-02-2006 18:17:30




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 Re: poxy primerOrange peel E in reply to DD MI., 12-02-2006 14:48:50  
As B says you can get by with one coat -- but I use two to make sure it is covered, I believe B uses the higher priced version which probably flows out better, at least it should for what it costs! It does not need to be put on heavily. I use PPG Omni MP 170. Two parts epoxy to one part catalyst. It does not go on absoultely smooth, but is close. If you want it perfectly flat, dilute with acetone according to instructions. Use no more than a 1.5 mm tip, a 1.3 mm will work. 1.8 mm is considered a primer tip, but that does not include epoxy. It is a non sandable primer, not meant to cover imperfections. Read the spec sheet and do exactly what it says. Having said all of that I don't know what your problem is as I have sprayed a good quantity of it and have never had that problem. Spray at 65-70 degrees or warmer for the best results.

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B-maniac

12-02-2006 19:12:47




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 Re: poxy primerOrange peel E in reply to CNKS, 12-02-2006 18:17:30  
Hi CNKS! Actually I do use the Omni and like it better than the DP. Seems to have a little more "body' to it than DP does , AND a lot lower cost. The DPLF does seem to go on wetter and flow flatter than Omni and that's why I can't understand his orange peel problem. May very well be gun tip sizes like you say. I use syphon, for many reasons, so couldn't even comment on HVLP.



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DurangoCase

12-02-2006 15:38:23




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 Re: poxy primerOrange peel E in reply to DD MI., 12-02-2006 14:48:50  
Sounds like you may need to clean/rebuild your gun. Is it colder than usual where you paint?



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B-maniac

12-02-2006 17:39:31




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 Re: poxy primerOrange peel E in reply to DurangoCase, 12-02-2006 15:38:23  
I am going to make the assumption that you followed the directions right to the letter. If you havn't , you should. The only time I have seen any "orange peel" in either PPG (DP) or Omni epoxy primer is when someone trys to put more than one coat on. The only time I ever put on two coats is on a sand-blasted surface or rough cast to assure the profile is covered completely. It is not intended to be used as a "build primer" and the more you put on the more orange peel you will get. One wet coat on smooth bare clean steel is enough. I am also assuming that you don't feel the need for any "surfacer" on this panel to correct any small defects. If you are , then the orange peel is of no concern as you will be sanding everything smooth. I don't use HVLP,so can't comment on that. Check batch no. or date with PPG to see how old it is or if it was part of a defective batch. Ditto on the catylist! They are usually pretty good about solving faulty product issues. Again , I've never had the problem and I've been using it since 1987.

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DD MI.

12-02-2006 17:37:30




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 Re: poxy primerOrange peel E in reply to DurangoCase, 12-02-2006 15:38:23  
gun runs paint ( top coat) fine.Shop has good heat 65f . I am new with hvlp . Is hvlp a good choice for primer? thanks



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glennster

12-03-2006 07:37:11




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 Re: poxy primerOrange peel E in reply to DD MI., 12-02-2006 17:37:30  
re hvlp guns. we use them exclsively here at our shop in northern illinois, epa requires it. they are a little different to get used to if you have been using a siphon gun. i cut my teeth on a #7 binks and a devilbiss jga gun. the hvlps do use a lot less material, less overspray, and a lot easier to clean. it just feels wierd with the cup on top. we use diamont, and have our own mixing system. seems hvlp guns are a little more touchy with line pressures. in the booth, i have a regulator at the main line input, plus a water trap and a filter, from there the airline goes to the gun with a seperate regulator on the gun. we set the first regulator at 100psi, the use the gun regulator for the final pressure drop. hold the trigger on the gun wide open to set the final gun pressure. be sure to use a good clean air hose, and use that only for painting. we had a guy use a hose one time in the metal shop with a line oiler, oh my god what a disaster when it got back to the paint shop. another tip i do, before you add paint or primer to the gun, rinse it and shoot a little of the reducer for the product your gonna shoot thru the gun. that will clear out any stray solvents from prior cleaning of the gun.

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CNKS

12-03-2006 08:55:31




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 Re: poxy primerOrange peel E in reply to glennster, 12-03-2006 07:37:11  
You've painted a heck of a lot more than I have, so whatever works. I have a regulator on the gun, but always leave it wide open, and use the wall regulator to set the pressure at the inlet gauge on the gun (in other words I really only need a gauge on the gun, not a regulator). That way it is impossible to accidently move the regulator on the gun while painting. I use cheap regulators on the gun, perhaps the better ones are harder to get out of adjustment when painting. I did a little painting with a cheap siphon gun over 20 years ago, basically a disaster for many reasons. When I started my hobby about 5 years ago I bought quality HVLP guns, there is a world of difference, night and day in favor of HVLP -- but, I have never used a good siphon gun.

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