Author Topic: Powdercoating prep question  (Read 3112 times)

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Offline ksmith0034

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Powdercoating prep question
« on: December 09, 2010, 02:50:19 PM »
I just got an Eastwood powder coating gun as an early Christmas present.  I didn't buy Eastwood's "Pre" - which is some type of prep wash.  So I am wondering what would be good to use after the part has been soda blasted but before it gets coated?  Denatured alcohol?  Mineral spirits?  I'm just guessing, so what do you guys use?
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Offline Kong

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Re: Powdercoating prep question
« Reply #1 on: December 09, 2010, 03:32:10 PM »
I use acetone as a final degreaser before painting, I'd bet it will work well with powder coating too.  Acetone leave no residue and is very good to lift grease and oil and just about any adhesive.
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Offline ksmith0034

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Re: Powdercoating prep question
« Reply #2 on: December 09, 2010, 03:45:28 PM »
Acetone!  That's what I was trying to think of.  Thanks!
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Offline 23tbucket

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Re: Powdercoating prep question
« Reply #3 on: December 09, 2010, 04:40:24 PM »
Acetone works fine. Use a squirt bottle...spray down your part and quicky blow off with compressed air. The acetone evaporates very fast...you will be able to see residue stains left behind.....spray again until all clean. Try not to touch your cleaned part...the oil from your fingers could mess up the job. If you have to use a cloth or gloves to handle or clean things...brush over the part with a light propane flame to burn off any fuzzies.
On engine parts that have been in or close to oil you need to sandblast...put part in oven at 450 for 2 hrs....let cool....sandblast again...clean with acetone. I sometimes use brakeclean...it's alot more expensive, but doesn't evapourate as fast.
In fact..lately I have been doing the double sandblast treatment on all cast aluminum parts...there sure seems to be a lot of gasses come out of the castings... even with new stuff!! I haven't had any problems since.

Good luck and have fun; Clifford
Note: Be very careful!!!...powdercoating is an addiction...lol

Offline Kong

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Re: Powdercoating prep question
« Reply #4 on: December 10, 2010, 03:59:53 PM »
23Bucket's comment brought something to mind that fits in nicely here, so here goes.  When I paint and hit he final prep stage, which is the last cleaning before I start shooting paint, from that time forward I wear plastic gloves all the way until its ready to cut and buff.  At no time after its been cleaned does anyone touch any parts that will be painted.  There is one exception to this, but it only happens when there the job is temporarily sealed and sent out to an artist for very specialized work.  I buy the gloves by the boxfull, I think there are 100 sets per box, at a local medical supply place, get the ones with no Talc, they're cheap insurance.  Oh, and if so much as a drop of L-thinner hits them they die.
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Offline ksmith0034

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Re: Powdercoating prep question
« Reply #5 on: December 10, 2010, 04:06:44 PM »
Good tip on the gloves.  I use them when I work on greasy/dirty stuff, so I always have a box on hand (so to speak).
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Offline Retro Rocket

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Re: Powdercoating prep question
« Reply #6 on: December 10, 2010, 04:25:42 PM »
Did powder coating for a couple of years and all prep was done with Acetone..... ;)

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Offline Gaither

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Re: Powdercoating prep question
« Reply #7 on: December 11, 2010, 02:30:40 PM »
+1 on the gloves.

FWIW  You might try "Nitrile" gloves (by the box Harbor Frt) instead of Latex.

I found 'em as I'm allergic to Latex (one of the most common allergys). I've enjoye 'em for years.

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Offline mcuozzo

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Re: Powdercoating prep question
« Reply #8 on: December 12, 2010, 03:19:50 PM »
FWIW, I use De-natured alcohol.  I think I read somewhere that it's better than acetone, but I can't remember why.  Maybe it was cheaper???

Like 23T said - you degrease, blast, bake, degrease, blast, blow it off, clean with Acetone, blow it dry, then coat.

And yeah, it's a slippery slope...

Here's some reading material for you...http://forum.caswellplating.com/powder-coating-questions/

Matt