paint prep for aluminum vents

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Old 08-31-18, 12:07 AM
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paint prep for aluminum vents

Before installing a total of 14 of these 2 1/2" round aluminum vents into a plywood soffit area I was wanting to probably spray paint them first, the same color as the soffit itself (white). Not sure about how to prep before priming then painting. Or perhaps there is special spray paint that might work fine on these (adheres to aluminum)? Should I treat the aluminum with some type/brand of chemical etching product before priming/painting? I want the paint to adhere good long-term and not have problems with it peeling/flaking from the aluminum anytime soon. Any comments/advice appreciated.

 
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Old 08-31-18, 01:08 AM
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Since they are clean AL nothing more needed than a light coat of primer.

Since you are painting them a light color one of the Rustoleum or Krylon gray automotive primers would work, they also make a primer labeled for AL, not sure how different it is!

https://www.rustoleum.com/product-ca...-primer-spray/
 
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Old 08-31-18, 01:24 AM
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Okay. Seems like there is a lotta info out there talking about how clean new aluminum should be etched before priming/painting, and that a "zinc chromate" type primer should be used, etc. otherwise paints don't adhere very well if such special prep is omitted.

https://www.jalopyjournal.com/forum/...uminum.125949/

https://forums.jlconline.com/forums/...st-to-aluminum

I'll at least look for the rustoleum primer product mentioned in the previous post; they might not have it at the hardware stores in my small town. They don't stock much specialized stuff.

Any further comments appreciated.
 
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Old 08-31-18, 02:51 AM
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Zinc chromate is overkill for what you need. The main thing when painting aluminum is for it to be clean. If I was to use any special primer it would be Rustoelum's etching primer - https://www.zoro.com/rust-oleum-auto...iABEgLhMfD_BwE
 
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Old 08-31-18, 08:12 AM
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Okay thanks for the helpful replies. I guess my aluminum soffit vents won't need quite the same paint prep as 1000 mph jets.
 
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Old 08-31-18, 08:21 AM
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Residential aluminum takes paint well.
If your vents were to see 1000mph - you wouldn't want to be in the same county!!
 
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Old 08-31-18, 08:30 AM
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I shall proceed much better informed. thanks again...
 
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