Derusting rusty cast iron plumbing

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jacob
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Derusting rusty cast iron plumbing

Post by jacob »

I have a cast iron(?) floor drain that received some standing water and is now a redbrown rusty eye-sore. I believe such plumbing is called "black pipe" but I might be wrong. It definitely was black, but now it's not.

My question is how to restore it?

Naval jelly? Sandpaper? Smearing it in oil and putting a blow torch to it just like curing a pan? :shock: Painting it?

JL13
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Joined: Sat May 17, 2014 7:47 am

Re: Derusting rusty cast iron plumbing

Post by JL13 »

I would consider painting it with one of those spray cans you can buy at the auto parts stores for painting a cast-iron engine block? You could try it first without removing the rust and see if it seals well enough? You'd still have plenty left over if a more involved solution is required.

bryan
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Location: mostly Bay Area

Re: Derusting rusty cast iron plumbing

Post by bryan »

https://hackaday.com/2016/03/17/laser-r ... ike-magic/

is it just surface rust (have you tried vinegar yet)?

drill with metal brush attachment, then apply rust converter and let it sit?

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