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Tool Talk Discussion Forum

Painting black pipe

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Bus Driver

01-31-2004 06:03:40




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Always used scrap bare steel in the past for welding projects, but made basement posts for the new house from 3" black pipe schedule 40- much heavier than the code requires. This pipe is new, not rusty. Is the black coating asphalt based? I doubt that this type pipe gets much cleaning or preparation before painting in the structural steel industry. I want to use Rustoleum oil based enamel. My plan is just to wire brush it clean and to paint. What are your suggestions/experience?

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Chuck MI

01-31-2004 17:24:02




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 Re: Painting black pipe in reply to Bus Driver, 01-31-2004 06:03:40  
We use black pipe for hot water heating in greenhouses. Just wipe it down with paint thinner and coat it up.



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uglyoldfatman

01-31-2004 13:49:49




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 Re: Painting black pipe in reply to Bus Driver, 01-31-2004 06:03:40  
Have not been in a plant for years, but when I was welding in them the painters would send a helper down the pipe rack with a wire brush and a rag and clean off the big stuff, then the painters would come thru and spray everything with "DEMETCOTE". Spelling may be off a bit, but it was pronounced "de met coat". A pale green/gray color.

This stuff STUCK!

If we had to cut it to weld something in the joint, we had to take a torch and heat it red hot and buff it with a wire wheel, two too three times to get it clean enough to weld.

Long-winded way to say--- knock the big stuff off, and paint it.

Rustolium should do well.

Good luck.

UG!

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Mac

01-31-2004 07:29:32




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 Re: Painting black pipe in reply to Bus Driver, 01-31-2004 06:03:40  
Years ago we used a lot of black pipe in an old factory, it was coated with a clear substance, laquer or varnish maybe, hard as heck. As time went on and we had to color code everything with paint, we just painted over the coating and never had any problems with it.



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Van in AR

01-31-2004 06:53:08




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 Re: Painting black pipe in reply to Bus Driver, 01-31-2004 06:03:40  
Most of the black pipe i've seen has a clear type coating on it. I get it off with a torch and wire brush prior to painting.
Van



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Brandon

01-31-2004 14:43:14




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 Re: Re: Painting black pipe in reply to Van in AR, 01-31-2004 06:53:08  
Lot of the time the pipe will have a oil residue on it.If you clean that of with brake cleaner and and spray it with the rustolem paint.



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