How can I repair a bathtub bottom that is losing its porcelain sheen?

Please don't tell me I have to replace the entire bathtub. It's an antique!

Answers:
there is enamel paints for that. my parents used it on their antique claw tub. it looks great

Other answers:
Sorry. You have to replace the tub.
Sorry. You have to replace the tub.
Be of good cheer: here is the cavalry!

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