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Prepping for primer

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zenoah

Joined: 01 May 2008
Posts: 4
Location: Navarre, FL

Posted: Wed Feb 18, 2009 4:11 pm Post subject: Prepping for primer

I was told by a local paint supplier that I should spray vinegar on the 

aluminum and then rinse it off with water prior to spraying self etching 

primer on it.  He said that is what they do on boats.  Has anyone ever heard 

this?  Good / bad?



Thanks,



Steve Sims

601 HDS

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Gig Giacona

Joined: 10 Jan 2006
Posts: 1416
Location: El Dorado Arkansas USA

Posted: Wed Feb 18, 2009 4:36 pm Post subject: Re: Prepping for primer

Sounds like a cheap acid etching to me. I have no idea if it would work but that is what he is trying to do with the vinegar.

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Posted: Wed Feb 18, 2009 10:29 pm Post subject: Prepping for primer

vinegar is a neutralizing agent and we used to use it after we cleaned our  pizza ovens at our Papa Johns but I have no idea why they would use it before  the etching unless it is to counter any acid based chemical residue which you  shouldn't have on new aluminum.

  

 Jeff

  	  Quote: 	
		  I was    told by a local paint supplier that I should spray vinegar on the 

aluminum    and then rinse it off with water prior to spraying self etching 

primer on    it.  He said that is what they do on boats.  Has anyone ever heard    

this?  Good / bad?

	


 

  

 A Good Credit Score is 7001267884/aol?redir=http:%2F%2Fwww.freecreditreport.com%2Fpm%2Fdefault.aspx%3Fsc%3D668072%26hmpgID%3D62%26bcd%3DfebemailfooterNO62"> See yours in just 2 easy steps!

  [quote][b]

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Gig Giacona

Joined: 10 Jan 2006
Posts: 1416
Location: El Dorado Arkansas USA

Posted: Thu Feb 19, 2009 6:11 am Post subject: Re: Prepping for primer

Vinegar is an acid. From Wikipedia...



"Vinegar is an acidic liquid processed from the fermentation of ethanol in a process that yields its key ingredient, acetic acid (also called ethanoic acid). "

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jimandmandy(at)yahoo.com
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Posted: Thu Feb 19, 2009 6:24 am Post subject: Prepping for primer

Oven cleaners are lye which is a strong base. Vinegar is acid, so it will neutralize the lye. In the case of aluminum, it would be an additional etch. If the oxide layer is thick, then I suppose self etching primer wont work? The main thing is to get rid of skin oils and other organic barriers on the surface. I use lacquer thinner for that.



--- On Wed, 2/18/09, Afterfxllc(at)aol.com <Afterfxllc(at)aol.com> wrote:

[quote]From: Afterfxllc(at)aol.com <Afterfxllc(at)aol.com>

Subject: Re: Prepping for primer

To: zenith601-list(at)matronics.com

Date: Wednesday, February 18, 2009, 10:27 PM



      vinegar is a neutralizing agent and we used to use it after we cleaned our  pizza ovens at our Papa Johns but I have no idea why they would use it before  the etching unless it is to counter any acid based chemical residue which you  shouldn't have on new aluminum.

  

 Jeff

  	  Quote: 	
		  I was    told by a local paint supplier that I should spray vinegar on the 

aluminum    and then rinse it off with water prior to spraying self etching 

primer on    it.  He said that is what they do on boats.  Has anyone ever heard    

this?  Good / bad?

	


 

  



 A Good Credit Score is 7001267884/aol?redir=http:%2F%2Fwww.freecreditreport.com%2Fpm%2Fdefault.aspx%3Fsc%3D668072%26hmpgID%3D62%26bcd%3DfebemailfooterNO62"> See yours in just 2 easy steps!  [quote][b]

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bryanmmartin

Joined: 10 Jan 2006
Posts: 1018

Posted: Thu Feb 19, 2009 7:44 am Post subject: Re: Prepping for primer

The oven cleaner you used was probably a strong alkali so a wiping down with a weak acid like vinegar after cleaning makes sense. The vinegar would neutralize any residue of the lye.

[quote="Afterfxllc(at)aol.com"]vinegar is a neutralizing agent and we used to use it after we cleaned our  pizza ovens at our Papa Johns but I have no idea why they would use it before  the etching unless it is to counter any acid based chemical residue which you  shouldn't have on new aluminum.

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do not archive.

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Posted: Thu Feb 19, 2009 7:53 am Post subject: Prepping for primer

On Wednesday 18 February 2009 18:36, Gig Giacona wrote:

 	  Quote: 	
		   



 Sounds like a cheap acid etching to me. I have no idea if it would work but

 that is what he is trying to do with the vinegar.




	


I've never done this to an airplane, but I've tried it on other things, when 

etchant wasn't available. It makes a cheap and readily available etchant for 

aluminum, and helps get rid of grease, etc. It does seem to help the 

adherance of a coat of primer or paint.



I'm leery of using non-aircraft products on aircraft, not because they 

necessarily don't work, but becaue they have no long term track record of how 

well they work in an aircraft environment.



Besides, my wife gets upset when I swipe the vinegar.



-- 

=============================================

                Do not archive.

=============================================

                Jim B Belcher

    BS, MS Physics, Math, Computer Science

                  A&P/IA

     Retired aerospace technical manager

=============================================

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Afterfxllc(at)aol.com
Guest

Posted: Thu Feb 19, 2009 3:35 pm Post subject: Prepping for primer

I wouldn't think Vinegar would be strong enough to etch the aluminum but  Stewart Systems sells a etching wash to use before you paint. Take a piece of  aluminum and stick it in some vinegar and see what happens. If you really want  to etch it good just get some cat urine on it and that will do it for sure but  it stinks to high heaven.

  

 Jeff

 A Good Credit Score is 700 o67884/aol?redir=http:%2F%2Fwww.freecreditreport.com%2Fpm%2Fdefault.aspx%3Fsc%3D668072%26hmpgID%3D62%26bcd%3DfebemailfooterNO62"> See yours in just 2 easy steps!

  [quote][b]

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