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Author Topic: Primer for the aluminum  (Read 1487 times)
Danny
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87' MCI 102A3 - getting there...


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« on: June 26, 2006, 07:10:33 PM »

I have finished installing my aluminum panels over the window openings.  Turned out pretty good if I do say so...

My question:  It is going to be fall before I actually look at painting her.  Do I need to be concerned with a primer over the exposed aluminum at this point?  ... Or for that matter - what primer is the best bet for the fall when I begin painting?

Thanks a bunch   Wink

Danny
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I have heard it said, "life comes at you fast".  I didn't know it would be in the shape of a bus  :-)
Bosshosssport96
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« Reply #1 on: June 26, 2006, 09:12:29 PM »

Danny, put either aluminun prep or alodine on the metal,(follow the directions)then put an etching primer on them.You should put some paint on those panels tho,its not good to leave primer on them to long........Frank
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rv_safetyman
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Jim Shepherd


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« Reply #2 on: June 27, 2006, 06:15:27 PM »

Danny, there are two different types of primer.  You would not use use the material often referred to as "primer surfacer" which is a "build" product to fill in surface defects.  It has no weather resistance.

Pasted below is a post I made on BNO last December.  I think the information is still good.

>>>BNO Post>>>>

The choice of primer is very important. I would not use anything less
than two part epoxy. I used PPG DP48 which is a white primer with a
slight sheen to it. Looks pretty good by itself. There are primers
that are used to build depth (primer/surfacer) and they are NOT
(repeat NOT) protective coatings. They will rust in no time.


The PPG DP line has been my choice for many years and has always been
called the super glue of paints. With reasonable preparation, it WILL
stick forever and not permit any rust. It was often used UNDER bondo
by the better shops to make sure the bondo stuck and that it would not
come off due to rust (bondo will let water pass through if there is a
slight crack in the cover material).


PPG DP48 (there are other numbers for other colors) costs about $100
plus the catalyst and thinner. In my opinion, it is money well spent
for the protection.


Now for the sad news (at least for me), it appears that PPG has
recently discontinued production of this paint. I have used it for
over 20 years and don’t know how I can get by without it. I just
bought some DP74 (red) less than six months ago, so the decision is
recent. I will make a quick trip to the paint store tomorrow to see if
I can find some. I did find a site that seems to have the product at
about half the price I paid (with supposedly a good discount):
http://www.midwestchemicals.com/DP48LF-DP402LF.htm


It looks like Dupont 2910 is about the same material.


One good wet coat should give you good protection and should look
good. Be very careful to wear breathing protection ­ this is some bad
stuff to breath.


If you use DP48 (and probably any of the two part epoxy primers), you
will need to sand it and recoat it before you apply any
primer/surfacer or top coat if it sits for more that a few weeks.
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Jim Shepherd
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JimC
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« Reply #3 on: June 27, 2006, 07:03:36 PM »

Danny,
It really should not matter if you put anything on the panels, aluminum does not rust. It will however get oxidized if exposed for a long time to the weather. If you are only looking at a few months you should be ok.
You will have to use a good aluminum prep to help any type of top coat adhere wether you do it now or later.

I agree with the both of the other posts, especially about the two part epoxy primer as a first coat after you clean with the aluminum prep. If you prep the metal like the directions say, you should have no problems with the paint sticking.

Jim Callaghan 4106
Wisconsin
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4106 - 8-71/730
Oconomowoc, Wisconsin
between Milwaukee & Madison
Danny
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« Reply #4 on: June 27, 2006, 07:31:19 PM »

Thanks guys for the information - !!!

Danny
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JohnEd
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« Reply #5 on: June 27, 2006, 11:09:04 PM »

boss is right.  PPG makes a cleaner and an etcher that MUST be used before painting/priming.  I saw an alu bodied step van that was professionally painted without that step and a year later it started getting blisters all over it.  It was the delivery van for a paint wholesaler/retailer shop.  I think the paint was epoxy but I am not sure.  It was top quality paint and was white enough to hurt your eyes in direct sun.

Talk to a PPG paint supplier and then ask a Sherwin williams dealer just to keep everybody honest.  After you get "real" smart let us know what they told you and what you decided.

Stay safe and happy

JohnEd   
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