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Priming techniques with Alumiprep, Alodine and Zinc Chromate

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lwinger

Joined: 21 Jun 2006
Posts: 229
Location: Tustin, CA

Posted: Sun Aug 27, 2006 10:00 pm Post subject: Priming techniques with Alumiprep, Alodine and Zinc Chromate

My scratch-built rudder parts are now complete, and I'm ready to prime.  I have purchased Scotchbrite 7447 (per the construction manual), Alumiprep 33, Alodine 1201 and PTI Zinc Chromate Primer from Aircraft Spruce (quart size can).  My plan is to use spray bottles to apply the Alumiprep and Alodine, and to brush on the Zinc Chromate.  In all cases I plan to wear eye protection, respirator, long sleeves and nitrile gloves.



I've read all the archived primer discussions, and I really don't have a desire to re-start them.  This request is specifically for any listers who are using zinc chromate for priming internal parts.  



(1)  How have you cleaned with Alumiprep or converted with Alodine when the parts are too big to fit in a full-immersion bath?  Spray? Cheesecloth? Other?



(2)  Have you ever brushed on the Zinc Chromate?  If so, what tips do you have?



(3) Any other suggestions on how to use these products safely and effectively?



Thanks for your feedback.

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Larry Winger
Tustin, CA
Plans building 601XL/650 with Corvair
Installing fuel system
www.mykitlog.com/lwinger

pacificpainting(at)comcas
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Posted: Sun Aug 27, 2006 10:18 pm Post subject: Priming techniques with Alumiprep, Alodine and Zinc Chromate

Larry,



I have been using zinc chromate on the internal parts of the wing I'm 

working on. All I have been doing is wiping down with lacquer thinner and 

spraying a light coat on the metal. I primed all of the parts before I used 

them except the skins which I did when I unwrapped them and got ready to 

install them. I don't think you will get everyone to agree to anything 

regarding priming. I tried removing the zinc chromate on some parts that 

would be on the outside of the wing, and I couldn't hardly get it off with 

lacquer thinner. I didn't plan on using alodine or alumiprep because it is 

too much work and it doesn't matter that much to me. You really don't have 

to do anything if you don't want. When you do apply it, whether by brush or 

spray, just put a light coat on. It's ok if you can see through it. That's 

the way it is supposed to be.



Just My Opinion

Dave in Salem

801

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Kemter

Joined: 18 Jun 2006
Posts: 12
Location: Cibolo, TX

Posted: Mon Aug 28, 2006 4:56 am Post subject: Re: Priming techniques with Alumiprep, Alodine and Zinc Chro

Larry,

  I was at the exact point you are a few days ago with my 701's rudder.  I opted to only wipe down the pieces with thinner and brush on PTI's zinc chromate with a disposable foam brush.  Once the zinc chromate was dry (a light coat dries really fast), I rivited the skeleton together.  I tried scraping off some of the zinc chromate last night (about 36 hours after I first applied it) with my fingernail and it wouldn't come off and was as hard as woodpecker lips.



Jim

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Jim Kemter
Cibolo, TX

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