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Self etching primer

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tjennings(at)gmail.com
Guest

Posted: Sun May 03, 2009 10:42 am Post subject: Self etching primer

Hi,



 I was wondering if anyone on here has used the self etching primer

from NAPA (#7220 which is actually sherwin williams) on their internal

parts? I'm using it on the ribs and spar of the rudder and was told it

was okay from several people but an A&P told me that this stuff will

eventually eat through the metal thus eventually causing corrosion

anyway.



Cheers,



 - Trevor

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bob(at)frontrange-pc.com
Guest

Posted: Sun May 03, 2009 11:18 am Post subject: Self etching primer

Trevor,



I used NAPA 7220 on my rudder internals as well. I seem to recall it was

popular among the RV builders. Yours is the first report I've heard of

regarding corrosiveness. If you are able to verify that info I hope you

post it here.



Do Not Archive



Bob Percival

701/Vair



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rene(at)felker.com
Guest

Posted: Sun May 03, 2009 12:34 pm Post subject: Self etching primer

I used the SW 988 (along with a PPG product) on my RV-10 and have seen no

problems.  It is my understanding that it is a perfect match between

application and product.  If you want to hear all types of opinions .....

just search the RV-10 and other RV archives.  Primer wars erupt all the time

on those forums.  If it gets slow on the list...just bring up "the best

primer" and your e-mail will fill up.



Good luck in your search for the bottom line on primers.



Rene'

801-721-6080

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bob(at)frontrange-pc.com
Guest

Posted: Sun May 03, 2009 1:07 pm Post subject: Self etching primer

I looked through the RV archives as Rene' suggested.  About the only

criticism I found was that this primer didn't hold up as well as some

others in areas where surfaces rubbed, and that it could be removed

years later with MEK and scotchbrite. [No color of scothbrite referenced

8^) ]. I saw no mention of this primer leading to corrosion issues and I

plan to continue using it.



Bob Percival

701/Vair



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Thruster87

Joined: 16 Apr 2008
Posts: 193
Location: Australia

Posted: Sun May 03, 2009 1:19 pm Post subject: Re: Self etching primer

Check this out for comparing a couple of different primers http://www.tabshred.com/moe/primer.htm

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MHerder

Joined: 11 Feb 2008
Posts: 143
Location: Fort Worth TX

Posted: Sun May 03, 2009 3:34 pm Post subject: Re: Self etching primer

Ive used the 7220 from Napa, workds great, dries quick.  And I'm not 100% sure, but I bet I'll be dead before this stuff corrodes through my aluminum.  



Everyone gets all worked up over corrosion.  I'll never understand the 75 yr old guy that I saw hand dipping each of his rivets in Zinc Chromate, exposing himself to carcinogens for hours on end... Really guys, really?  Where are you going to be in 20 yrs, 30 or more???  I'm 27 and not too concerned with the fact that I haven't applied corrosion protection to every surface.



Ok, there's my two cents, maybe Id feel differently if I lived on the coast, in an extremely polluted city, and tied down instead of hangared, but none of those three apply.



On the otherhand our .016 used on a lot of our birds is pretty thin stuff to begin with, but I'm STILL not too worked up about it.  My plan is to spray the inside with corrosion x every couple of years if anything.

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_________________
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rjscep(at)yahoo.com
Guest

Posted: Sun May 03, 2009 7:17 pm Post subject: Self etching primer

 	  Quote: 	
		   I have used it and don't see any sign of corrosion. I also ued some

 other etching brand that was from the same store its a cheaper one that

 has more content than the SW brand. I am also using a self etchant from

 an auto supply store....Do not archive


	


--- On Sun, 5/3/09, Trevor Jennings <tjennings(at)gmail.com> wrote:



 	  Quote: 	
		   From: Trevor Jennings <tjennings(at)gmail.com>

 Subject: Self etching primer

 To: zenith-list(at)matronics.com

 Date: Sunday, May 3, 2009, 7:40 PM

 

 Trevor Jennings <tjennings(at)gmail.com>

 

 Hi,

 

  I was wondering if anyone on here has used the self

 etching primer

 from NAPA (#7220 which is actually sherwin williams) on

 their internal

 parts? I'm using it on the ribs and spar of the rudder and

 was told it

 was okay from several people but an A&P told me that

 this stuff will

 eventually eat through the metal thus eventually causing

 corrosion

 anyway.

 

 Cheers,

 

  - Trevor

 

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