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Tim Juhl
Joined: 21 Mar 2006
Posts: 488
Location: "Thumb" of Michigan
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 Posted: Fri Aug 25, 2006 4:36 pm Post subject: Self-etching primer |
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Any opinions pro or con about using aerosol self-etching primer for corrosion protection on internal surfaces that are to be riveted together? I checked the archives but what I found was inconclusive on this point.
Tim
Do not archive
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dredmoody(at)cox.net
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| Posted: Fri Aug 25, 2006 4:52 pm Post subject: Self-etching primer |
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The plane (a 601XL) is still under construction so I can only offer opinion
without a history to back it up or a control to compare to.
I am using Tempo self-etching zinc oxide (not chromate) primer (from rattle
cans) on all the interior of the plane and any overlap areas that can't be
primed and painted when the plane is finished. My rule is if it can't be
primed and painted later, prime it now. I will feel safer for having done
this but as I said, I have no proof that I am actually safer. It does take
time and cost money and adds weight but my decision remains the same despite
those negatives.
Ed Moody II
Rayne, LA
601XL/ fuselage
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Ron Lendon
Joined: 10 Jan 2006
Posts: 685
Location: Clinton Twp., MI
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pacificpainting(at)comcas
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| Posted: Fri Aug 25, 2006 6:26 pm Post subject: Self-etching primer |
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Tim,
I think you will find it difficult to determine if priming, no matter what
you use is necessary or not. So far I have used self etching from spray
cans, sprayed with an HVLP and have also used some zinc chromate. I'm doing
it because I have all the equipment to spray it, it's easy to do and it
could possibly help with resale if that ever comes up. If you have looked in
the wings of factory plans, a large portion of them have never been primed.
Where you live can be a major factor. If you are around a lot of salt air I
would do it for sure. There are probably people on the list that can
contribute a lot more information than I can. I have read a lot about it and
it seems to me that if it makes you feel better to prime then do it. You can
also just brush a strip on the mating surfaces.
Dave in Salem
801
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J2j3h4(at)aol.com
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| Posted: Fri Aug 25, 2006 6:37 pm Post subject: Self-etching primer |
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Rattle can primer by itself will not provide corrosion protection. It must be covered with a sealing coat of paint. Two part epoxy will provide protection by itself. At least this seems to be the consensus on the RV list serves after many hours of "primer wars". I do not want to start a similar war on this list, and I have not personally conducted tests on aluminum to confirm this, so I will not debate the point. However, I did some extensive body work on a car once and could not finish it in a single session, so just painted it in primer after each day's work. I drove it between work sessions, including through some rain. When I went to finish the job, I found the steel rusted under the primer. If you wish to review the RV debates go to
Jim Hasper
Ex-RV builder
In a message dated 8/25/2006 7:54:38 P.M. Central Daylight Time, dredmoody(at)cox.net writes:
[quote]--> Zenith-List message posted by: "Edward Moody II" <dredmoody(at)cox.net>
The plane (a 601XL) is still under construction so I can only offer opinion
without a history to back it up or a control to compare to.
I am using Tempo self-etching zinc oxide (not chromate) primer (from rattle
cans) on all the interior of the plane and any overlap areas that can't be
primed and painted when the plane is finished. My rule is if it can't be
primed and painted later, prime it now. I will feel safer for having done
this but as I said, I have no proof that I am actually safer. It does take
time and cost money and adds weight but my decision remains the same despite
those negatives.
Ed Moody II
Rayne, LA
601XL/ fuselage
---
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TxDave
Joined: 22 Jul 2006
Posts: 168
Location: Temple, TX
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| Posted: Sat Aug 26, 2006 7:15 am Post subject: Self-etching primer |
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Well, here's my 2 cents worth. I started out using zinc chromate, but
switched to the NAPA self-etching primer. Number one reason...better
adhesion (with same prep). I prep with Scotch-Brite followed by cleaning
with acetone. The zinc chromate is easy to scratch off. The self etching
primer is virtually bullet proof. It really sticks. The NAPA primer is cheap
and readily available. I'm sure there are better (i.e. more expensive)
alternatives, but any primer should be better than no primer.
Dave Clay
Temple, TX
Ch601XL Scratch builder
www.daves601xl.com
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dredmoody(at)cox.net
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| Posted: Sat Aug 26, 2006 7:48 am Post subject: Self-etching primer |
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Regarding use of primer alone, remember that the primer has little or no UV
resistance by itself. It will only hold up long term on the inside or an
overlap area. I do agree that whether or not it really makes a big
difference in aircraft durability and corrosion resistance, it can't hurt,
and it is likely to be a positive factor in a resale situation.
For what it's worth, my prep has been wipe clean twice with denatured
alcohol, then once more with laquer thinner, no scuffing at all (scratches
in the surface are pointless and will not produce much real benefit... the
etching produces way more adhesive surface) then spray according
manufacturer's directions with ventilation and a charcoal filter mask.
Ed Moody II
| Quote: |
<dclaytx2(at)hotmail.com>
Well, here's my 2 cents worth. I started out using zinc chromate, but
switched to the NAPA self-etching primer. Number one reason...better
adhesion (with same prep). I prep with Scotch-Brite followed by cleaning
with acetone. The zinc chromate is easy to scratch off. The self etching
primer is virtually bullet proof. It really sticks. The NAPA primer is
cheap and readily available. I'm sure there are better (i.e. more
expensive) alternatives, but any primer should be better than no primer.
Dave Clay
Temple, TX
Ch601XL Scratch builder
www.daves601xl.com
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Tim Juhl
Joined: 21 Mar 2006
Posts: 488
Location: "Thumb" of Michigan
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| Posted: Sun Aug 27, 2006 3:17 pm Post subject: Re: Self-etching primer |
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Thanks for your thoughts guys. I believe that corrosion proofing between mating surfaces is a good idea. Most Cessnas I've seen do not have any interior primer or paint and a little mild surface corrosion is usually visible. In a Florida plane I found the areas where moisture could be trapped showed more evidence of corrosion. I made it a point to treat the inside of such aircraft with ACF or a similar mist-on anti corrosion treatment.
What I really wanted to know with my question about using self-etching primer between mating surfaces was whether there was any chemistry-related or other reason that would make it's use in this manner a poor idea. It is hard to find zinc chromate or zinc oxide locally so it would be nice to be able to use something that didn't have to be ordered by mail.
Tim
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_________________
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CFII
Champ L16A flying
Zodiac XL - Jabiru 3300A
Almost done! It'll fly in spring! |
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