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I recently had plumbing repairs in my shower and they had to remove a section of the wall. I discovered that the tub lip in one corner has rusted badly. The rest of the tub lip has little to no rust damage. I plan to install backer board flush with the lip and have the tile hang over the lip as illustrated below. Is there a way to fix the rusty tub lip before I install the tile? Do I need to fix the lip? Do I need a new tub? Thanks. enter image description here

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  • Phosphoric acid is the best to treat rust. Find some stuff includes it.
    – user263983
    Aug 30 at 0:58
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Rusty steel tubs tend to get worse, not better, nor even stop where they are. When it inevitably rusts more, you'll be ripping out any tiling you do now as well as the old tub.

You can certainly try various rust-treatment nostrums, but I'd suggest just facing the tub replacement now as the more certain path to a tile job that can stay put on a tub that's not going to rot away. I would not suggest a steel tub for the replacement.

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  • I'd give the +1 simply for the use of "nostrum" (TIL a new word!). The rest of the advice sounds reasonable, too.
    – FreeMan
    Aug 30 at 13:24
  • Quick search at Home Depot shows that a basic steel enameled tub is $160. It's an expense for sure, but compared to the time and cost of the tile job, not a big deal.
    – JPhi1618
    Aug 30 at 15:54

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