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Old 08-28-2013, 12:27 AM   #1
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Is this rust directly on gas pipe or the paint on the pipe?


Wrong type of paint used on the pipe? I don't seem to observe rust on the gray/silver part of the pipe coming from the utility meter. The white paint is on pipe on the house side of the connection.
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Old 08-28-2013, 04:10 AM   #2
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Is this rust directly on gas pipe or the paint on the pipe?


A possibility the white is a primer and primer won't prevent rust.

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Old 08-28-2013, 07:34 AM   #3
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Is this rust directly on gas pipe or the paint on the pipe?


Looks typical of steel pipe painted with water based paint---Only way to prevent bleed through like that is to seal the steel with an oil based paint or primer.
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Old 08-28-2013, 08:33 AM   #4
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Is this rust directly on gas pipe or the paint on the pipe?


Paint doesn't rust. It's not metal.
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Old 08-28-2013, 08:58 AM   #5
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Is this rust directly on gas pipe or the paint on the pipe?


Flat paint absorbs moisture. I would get a small can of acrylic enamel that matches the house paint to do the pipe in.
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Old 08-28-2013, 07:38 PM   #6
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Is this rust directly on gas pipe or the paint on the pipe?


Only way to do the job right- and you may not want to- sand blast the paint off, and the rust down to bare metal, OR remove all paint with solvent.abrasive, then address the rust. One way to remove rust if with muriatic acid, paint on, let sit a bit (5 minutes) wash offf with water. repeat if still stubborn rust. Muriatic is the only practical, low cost, quick chemical that will dissolve rust. Then, dry 100% with air/hair dryer. Then, prime with metal primer, then oil paint.

No other way to stop the rust- most above advice will "cover up" the rust for even up to a year, but rust will still be festering beneath.
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Old 08-28-2013, 10:10 PM   #7
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Is this rust directly on gas pipe or the paint on the pipe?


Thanks all for the info.

noquacks,

if I leave the rust on and just paint over it, will the existing rust "grow" or expand over time or will it just "exist". As long as it doesn't grow to be a problem, painting over it seems the simpler option.

if I do any of the rust removal, particularly the sanding, I assume might want to turn off the gas, since it's a gas pipe?

Also, is metal primer really necessary or is oil based paint meant for metal good enough?
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Old 08-29-2013, 07:58 AM   #8
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Is this rust directly on gas pipe or the paint on the pipe?


Sand down the rust spots prime and paint.
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Old 08-29-2013, 11:19 PM   #9
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Is this rust directly on gas pipe or the paint on the pipe?


There is no need to turn off the gas while you are sanding. If you already smelled gas you have another problem and the light sanding required to remove the rust won't cause a problem.
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Old 08-30-2013, 02:46 AM   #10
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Is this rust directly on gas pipe or the paint on the pipe?


Quote:
Originally Posted by Msradell View Post
There is no need to turn off the gas while you are sanding. If you already smelled gas you have another problem and the light sanding required to remove the rust won't cause a problem.
I was under the impression sanding the rust off might take some force to achieve, and thus wouldn't want to shake the pipes while gas is on. But hope I'm just thinking worst case and that the rust actually comes off easily...
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Old 08-30-2013, 08:29 AM   #11
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Is this rust directly on gas pipe or the paint on the pipe?


Rust-oleum white metal primer consider the pipe wrench grabs as causing the rust be liberal with the brush.couple of coats baked in the sun per day 16oz cans even maybe spray it
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Old 08-31-2013, 11:36 PM   #12
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Is this rust directly on gas pipe or the paint on the pipe?


I went checking the rest of the house. There's another section of gas pipe outside the house.

But interestingly, the lower part of this section near the ground does not appear to have any rust. I think it is same paint/primer used.

And I notice that for the back of the vertical gas pipes in both sections, there is rust running down a line. These gas pipes by the exterior wall are shielded with a roof eave that extends 2 feet out, but slanted rain against the side of the home can hit these pipes still.

I'm curious to wonder why the lower horizontal gas pipe near the ground appears to have no rust and why there's more rust on the back of the pipes facing the wall than the front that is exposed and you can see more clearly.

Does it have to do with how moisture attracts/attaches onto the pipes? And the higher things are or where there are gaps between a pipe and wall, moisture better condenses on?
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