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04-07-2009, 03:12 PM
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#1
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4 Rivet Member
1962 22' Flying Cloud
Bend
, Oregon
Join Date: Dec 2008
Posts: 370
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Painting raw aluminum
I tried searching for this, and I don't know if it's just me, but the search function does not function! Anyway as part of our interior restoration, we replaced some of the interior panels with new aluminum. My question is, do we need to do any special preparation such as ruffing or etching the surface before we apply the primer coat to the metal? As always, I look forward to a knowledgeable answer from the forum!
FLYNCLD
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04-07-2009, 03:33 PM
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#2
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Rivet Master
, Minnesota
Join Date: Aug 2003
Posts: 7,721
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If you were doing the outside, I would recommend you etch and use an aluminum primer, but. . .
Since it's inside, I would try a direct-to-metal tintable acrylic primer such as Devoe "DevFlex PF" You can get it in flat or semigloss. Sure is a lot easier than going through the whole etching process.
Should be available at any dealer who carries ICI & Glidden products.
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04-07-2009, 03:39 PM
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#3
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Rivet Master
1977 Argosy Minuet 6.0 Metre
1973 21' Globetrotter
1975 26' Argosy 26
Vista
, California
Join Date: Sep 2006
Posts: 589
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I have had best results when i gave the surface a quick sanding and wipe down with prep solvent,just before primeing.
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04-07-2009, 03:48 PM
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#4
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Rivet Master
1992 34' Excella
Austin
, Texas
Join Date: Mar 2007
Posts: 563
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A mono layer (a layer one atom thick) of aluminum oxide forms on the surface of freshly exposed aluminum at standard temp/pressure in about an hour. The oxide layer is what causes most coatings to fail since the coating is adhered to the oxide layer rather than the metal. Once the aluminum is exposed you have to go into turbo mode to seal it off from the oxygen in the air to stop the oxide formation.
__________________
Crusty
"If you come to a fork in the road, take it."
Lake Travis, TX
"Rancho Deluxe"
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04-07-2009, 03:48 PM
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#5
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Rivet Master
1965 17' Caravel
1983 27' Excella
Walnut Grove/Laguna Woods
, California
Join Date: Jun 2004
Posts: 1,635
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Quote:
Originally Posted by bibbs
I have had best results when i gave the surface a quick sanding and wipe down with prep solvent,just before priming.
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I agree....Why treat aluminum any different than any other metal when it comes to painting. I would sand with 600 wet-or-dry paper, metal prep, prime and paint. If you don't give the metal a "tooth", the primer will not bond. I believe that is why the clear coat on the outside goes away in such a short time.
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04-07-2009, 06:20 PM
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#6
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4 Rivet Member
1962 22' Flying Cloud
Bend
, Oregon
Join Date: Dec 2008
Posts: 370
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Thanks for the tips. I sanded down a test section, used a pre-cleaner and applied the primer (BTW- A special Low-VOC metal primer) with great success. Onward!
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04-07-2009, 07:15 PM
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#7
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4 Rivet Member
1962 22' Flying Cloud
Bend
, Oregon
Join Date: Dec 2008
Posts: 370
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PS- Finally found this link to a previous thread, but only by searching Google, not the Forum. From previous experience the Google search is much more likely to produce results on the Forum than the Forum search is. Am I doing something wrong??!!???
http://www.airforums.com/forums/f44/...ior-44433.html
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