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Old 11-05-2013, 06:33 PM   #1
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what is chalky residue?


should have posted a before and after photo. Too late.

When I bought this house last yr I could tell the double garage door had been dark brown at one time. (white inside) When I got the house the door was orange.

I've smudged the door and the orange came right off. Today using only water and a rag I washed 90% of the chalky orange stuff off. The door looks 100% better.

It wasn't quite rust, as the surface under the orange seemed fairly decent. So what was the chalky orange?

I'm thinking of using TSP to clean it even better. I don't have time to paint it now. The surface isn't smooth, but a deep wavy grain in the ? aluminum or whatever it's made of, so I'll probably have to use a brush when I do paint it.

thanks

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Old 11-05-2013, 06:48 PM   #2
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what is chalky residue?


http://www.house-painting-info.com/chalking-paint.html
No need to use a brush except for any missed details
I've even used a foam roller and it can out perfectly smooth.
Sherwin Williams Super paint works well for this job.

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Old 11-05-2013, 07:03 PM   #3
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what is chalky residue?


thanks Joe.

No doubt this Fla. sun attributed to it. Guess I'm better off with the chalk than peeling according to your link.

Would Gardz be a good primer?
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Old 11-05-2013, 07:07 PM   #4
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what is chalky residue?


Unless your changing the color drastically or there's missing coating there's no need to prime it.
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Old 11-05-2013, 07:28 PM   #5
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what is chalky residue?


It's probably the darkest brown color possible now. When I paint it I want a lighter color, that will blend in with the brick, a medium beige or medium tan.

Is that considered a drastic change?

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Old 11-05-2013, 07:36 PM   #6
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what is chalky residue?


Two coats of Super paint should be fine.
If you still want to prime it I'd just use Zinsser 123 and have them tint it to 50% of the color your going for.
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Old 11-05-2013, 08:59 PM   #7
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what is chalky residue?


Yep-

Chalking paint is considered an "unsound" surface, & therefore must be washed-off, until "no chalking" remains obviously!
A garage-door takes a beating in the sun. No matter how good the final paint choice is, I'd prime it!!!

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Old 11-05-2013, 09:06 PM   #8
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what is chalky residue?


It sounds like the orange residue was extremely oxidized brown paint. Cheap paint completely broken down by the elements and faded out to the point that it looked orange.

Joe is right, couple coats of paint would do the trick. It's fine to prime with 123 or something, but IME latex will bond great to clean aluminum.

Just make sure you have removed ALL the oxidation, it sounds like you got it pretty clean.
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Old 11-06-2013, 07:33 AM   #9
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what is chalky residue?


really appreciate the help.

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