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I bought an used stainless steel really large pot (>90 liters) that was used for cooking, but had some kind of water stains inside.

On a (stupid) attempt to clean it, I had it sand blasted, which completely removed that nice, reflective surface that the stainless steel have, leaving an opaque darkish gray surface.

Is this fixable somehow, maybe by polishing or chemical treatment? If its not, is it still safe to use it?

Update. This is what it looks like now:

enter image description here

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Do you have some pictures? –  jards Sep 22 at 2:55
    
You can get a mirror finish on stainless steel with sand paper. Use wet/dry paper, and lubricate with water. You'd have to start with a coarse grit (60? 100? Depends on what size holes the sand-blasting made), and move to progressively finer grits, 200, 400, 800, etc. ending around 2000 grit. If you stop at 400 or 800, you'll get a satin finish instead. It's a lot of work. You could probably use a power tool of some sort for the outside of the pot, but I can't imagine how to do this for the inside. –  Tobias Patton Sep 22 at 14:17
    
Thanks @TobiasPatton. I will try that. Shouldnt that be an anwser instead of a comment? So that I can accept it if it works? –  romaia Sep 22 at 19:52
    
You can get abrasive wheels and brushes for electric drills that should work well on the inside. –  TMN Oct 10 at 15:15

2 Answers 2

I think you've ruined it. Sorry.

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Do you speak from experience? I mean, did that happen with you as well? I am questioning since Tobias gave some hopes for fixin it using sand paper. –  romaia Sep 22 at 19:57
    
No, I don't speak from experience. I guess you have nothing to lose by trying. –  Denny Conn Sep 22 at 21:14

I have seen stainless steel handrails and pipelines fixed and welded on site, to get the finish back the guys use abrasive strips of varying grades until it shines. I imagine you only need to get the finish back to a point where there are no areas that bacteria could hide in the rough finish, so a satin finish should be fine and then make double sure with the sanitising before using the pot each time.

Hope this is helpful

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Thanks. I haven't had the chance to test this yet (as Tobias also sugested the same method), but when I do I will post the results (and accept the answer) –  romaia Oct 6 at 21:10

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