Painting a heating pipe

Old 03-04-14, 09:05 PM
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Painting a heating pipe

Hi everyone,

5 years ago I painted this heating pipe with Rust-Oleum. A relatively small part of it has cracked and chipped.

I have 3 questions:

1) What do you think I should do now:
a) Strip the whole pipe and repaint?
b) Strip just the cracked portion of the pipe and repaint that portion?
c) Just paint over the cracked portion of the pipe?

2) Do you think I should use Rust-Oleum or something else?

3) Why do think it might have cracked?
a) Perhaps I shouldn't have used Rust-Oleum?
b) Perhaps I didn't strip that portion of the pipe well enough before painting?

Thank you
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Old 03-05-14, 01:36 AM
Join Date: Mar 2006
Location: Wet side of Washington state.
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Is the paint okay elsewhere on the pipe? If it is then I would clean the chipped area with wire brush, scraper and sandpaper to bare metal and then use a coat of Rustoleum primer followed by two coats of the Rustoleum finish color. If it is chipping and crazing along the entire length of the pipe I would clean as best as you can and use a high heat paint according to instructions.

I will add that most paints should be able to withstand the nominal temperatures used in residential heating systems without problems. What is the high temperature limit for your system set at?
Old 03-05-14, 04:20 AM
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If it's just a small area, I'd scrape, sand, primer and repaint that area with the same paint. Usually when heat is involved [and not using heat paint] thin coats fare better than thick or multiple coats. I think the layers of paint interfere with the heat escaping leading to the paint failure.

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