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Old 03-08-2008, 05:53 PM   #1
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Cleaning steel for painting?


I am in the process of building a steel patio cover in my back yard. I went to pick up all the steel the other day and It's covered with a black greasy film. I am going to paint this as soon as I weld the structure. Any ideas on how to clean this film off.
I have heard of using muratic acid (diluted) for this. Any ideas.



Moderator: Please move this to the painting forum...sorry

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Last edited by ebjack; 03-08-2008 at 06:11 PM.
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Old 03-08-2008, 10:58 PM   #2
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Cleaning steel for painting?


I would use mineral spirits, it's a lot less aggressive then acid.
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Old 03-09-2008, 08:05 AM   #3
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Cleaning steel for painting?


This may seem a bit silly but,dawn dish detergent and a scrub brush seems to be a great grease cutter.I have used it before I used other more harsher chemical products.
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Old 03-09-2008, 01:13 PM   #4
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Cleaning steel for painting?


Quote:
Originally Posted by mark942 View Post
This may seem a bit silly but,dawn dish detergent and a scrub brush seems to be a great grease cutter.I have used it before I used other more harsher chemical products.
Ayuh,.....

The Above,+ a Good Sanding should get you ready for Primer,+ Topcoat....
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Old 03-09-2008, 05:14 PM   #5
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Cleaning steel for painting?


thanks for the replies. The I-beams are gonna be hard to sand but the rest should be easy.
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Old 03-09-2008, 10:20 PM   #6
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Cleaning steel for painting?


I've been wondering if sand or soda blasting would take the greasy film off of the steel. I would think it should do a good job of it, as long as, a person didn't use too much pressure. Or maybe even a pressure washer with about 1800 psi.

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