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#2016234 - 09/13/10 06:28 PM Painting anodized parts
JHZR2 Offline



Registered: 12/14/02
Posts: 40532
Loc: New Jersey
Hi,

Need to replace a door check on my 82 MB. The OE ones were painted. I got the right aerosol paint from paintscratch, but would appreciate suggestions on how to prep. I have their aerosol primer. Do I just need to degrease?

Thanks!

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#2016321 - 09/13/10 08:23 PM Re: Painting anodized parts [Re: JHZR2]
JHZR2 Offline



Registered: 12/14/02
Posts: 40532
Loc: New Jersey

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#2016334 - 09/13/10 08:38 PM Re: Painting anodized parts [Re: JHZR2]
robshelton Offline


Registered: 07/10/09
Posts: 504
Loc: Winston-Salem, NC
I would use a gray scratch pad and lacquer thinner until there is no shine anywhere on the part, then use a zink chromate primer and let it dry - really dry. Wet sand anything (1000 grit or higher) that needs it and then paint. You probably will want to run a tap thru any threaded bolt holes after painting.

Or you could just leave it anodized! Good Luck!
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#2016364 - 09/13/10 09:27 PM Re: Painting anodized parts [Re: JHZR2]
tom slick Offline


Registered: 05/26/03
Posts: 9206
Loc: Central Coast, Calif.
Is the part aluminum? Looks like steel to me so it wouldn't be anodizing, just a zinc coating. degrease it and hit it with a self etching primer then paint.
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#2016421 - 09/13/10 10:43 PM Re: Painting anodized parts [Re: tom slick]
JHZR2 Offline



Registered: 12/14/02
Posts: 40532
Loc: New Jersey
Dont think it is aluminum, and Ill be taping off the sections not visible when installed.

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#2016427 - 09/13/10 10:56 PM Re: Painting anodized parts [Re: JHZR2]
tom slick Offline


Registered: 05/26/03
Posts: 9206
Loc: Central Coast, Calif.
Make sure the primer is for galvanized steel. regular primer doesn't like to stick to zinc.
_________________________
You get what you pay for...
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#2016444 - 09/13/10 11:28 PM Re: Painting anodized parts [Re: tom slick]
scurvy Offline


Registered: 02/19/07
Posts: 2370
Loc: Chicago IL USA
Originally Posted By: tom slick
Is the part aluminum? Looks like steel to me so it wouldn't be anodizing, just a zinc coating.

Ditto, that part has a zinc chromate conversion coating (probably hexavalent chrome-free for RoHS unless it's NOS)... some of the new coatings can be dyed yellow for the same look as the previous yellow chromate but without any of the deadly chromium compounds. Corrosion resistance is quite good as well.

Tom's advice for looking for a galvanized primer is good as well.
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#2016607 - 09/14/10 08:23 AM Re: Painting anodized parts [Re: scurvy]
Kestas Offline



Registered: 06/04/02
Posts: 11923
Loc: The Motor City
I'll bet you the part is magnetic and the coating is a dichromated zinc.

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#2016919 - 09/14/10 02:46 PM Re: Painting anodized parts [Re: Kestas]
Trav Offline


Registered: 11/20/06
Posts: 16524
Loc: MA, Mittelfranken.de
Looks like a metal stamping.I would just prepsol it and spray it first with duplicolor self etching primer (green) it can be had at AA for ca $7. It will etch into the metal no need to scuff just shoot regular primer right over it when it dries (about 30min).
scuff with 400 and wipe it off with prepsol and spray color or base/clear coat.Put a extra bolt in the threaded holes while spraying.

Make sure you wipe the part down with a paper towel after using prepsol or it will fisheye.
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#2017965 - 09/15/10 04:03 PM Re: Painting anodized parts [Re: Trav]
mechtech2 Offline


Registered: 09/05/06
Posts: 19479
Loc: Chicago Area
I'd leave that protective coating on there. It looks to be steel?
A light scotch brite scuffing, primer, then paint, should suffice very well.

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#2018189 - 09/15/10 08:14 PM Re: Painting anodized parts [Re: mechtech2]
JHZR2 Offline



Registered: 12/14/02
Posts: 40532
Loc: New Jersey
Yeah, I didnt want to remove it... Just verify what was needed to get paint/primer to stick. Thanks!

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