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Primers for bare aluminum

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Aluminium primer "Benno" <j.m.bennison@ntlworld> Sat, 17 Mar 2001 18:17:27 -0000
Re: Aluminium primer Paul Stevens <pauls1@bellsouth> Sat, 17 Mar 2001 14:08:28 -0600
Re: Aluminium primer "Don & Sheri Jones" <dcjones@ccis> Sat, 17 Mar 2001 19:34:16 -0800
Re: Aluminium primer jimbehning@atl.mindspring Sun, 18 Mar 2001 12:25:41 GMT



From
From: "Benno" <j.m.bennison@ntlworld>
Subject: Aluminium primer
Date: Sat, 17 Mar 2001 18:17:27 -0000
Organization: ntlworld News Service
Newsgroups: rec.autos.makers.vw.watercooled
 
The paint on my non factory fitted sunroof which is made of aluminium had
bubbled in a couple of places so I rubbed it down and painted it with
cellulose primer and top coat but I have noticed that the paint has lifted
off in places (6 moths later).Does anyone know if you need a special primer,
thanks.




From
From: Paul Stevens <pauls1@bellsouth>
Subject: Re: Aluminium primer
Date: Sat, 17 Mar 2001 14:08:28 -0600
Newsgroups: rec.autos.makers.vw.watercooled
 
Benno wrote:
> 
> The paint on my non factory fitted sunroof which is made of aluminium had
> bubbled in a couple of places so I rubbed it down and painted it with
> cellulose primer and top coat but I have noticed that the paint has lifted
> off in places (6 moths later).Does anyone know if you need a special primer,
> thanks.

One of the most common primers used on aircraft aluminum is Zinc 
Chromate.  A much better primer (used on the more expensive aircraft 
paint jobs) would be an epoxy primer.

Paint separating from aluminum isn't always a problem with the 
primer.  It's often (if not usually) a problem with improper surface 
preparation before the primer is applied.  The aluminum surface has 
to be completely clean.  The complete surface prep (for aircraft) 
includes an etch wash to remove any corrosion or other contamination, 
followed by an alodyne prep (chromic acid solution, if I recall 
correctly) to form a corrosion barrier.  Followed by the primer.

-- 
Paul Stevens
Sleeping Dragon Forge
http://www.geocities.com/Heartland/Lake/7316/index.html
Do it for the children!
http://rosie.acmecity.com/showtunes/69/index.html




From
From: "Don & Sheri Jones" <dcjones@ccis>
Subject: Re: Aluminium primer
Date: Sat, 17 Mar 2001 19:34:16 -0800
Organization: Randori News Inc. -- http://www.randori.com -- Great USENET!
Newsgroups: rec.autos.makers.vw.watercooled
 
Benno,
Paul is right on the money about the alodine. What you ideally want to do is
remove the parts from the car and have them glass bead blasted so they are
completely free of any paint. Next take them to your local plating shop and
tell them you want to have them alodine the parts for you, there will be a
lot charge but you shouldn't have to pay more than $50.00 for them to do it.
It is a short process and if your nice to the guy he may do it while you
wait it shouldn't take more than 20 minutes or so. Keep in mind he may be
busy so you may have to leave the parts, because he isn't going to make his
high volume customers wait. All that being said the etch was is just the
plater dipping your parts in Caustic and rinsing with water before plating
and should be included in the price. You will probably have a real problem
finding Zinc Chromate primer, so just use regular primer and a high quality
paint and you should be okay.

HTH





From
From: jimbehning@atl.mindspring
Subject: Re: Aluminium primer
Date: Sun, 18 Mar 2001 12:25:41 GMT
Organization: MindSpring Enterprises, Inc.
Newsgroups: rec.autos.makers.vw.watercooled
 
I was going to suggest that there are etching primers at the paint
shop for aluminum. Aluminum starts to oxidize as soon as you clean it.




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