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Yes, you can use Epsom salt in a refinished bathtub. The salt will not harm the new glaze finish chemically, although it may rough up the surface finish a bit. Consult a professional bathtub refinisher prior to using Epsom salt on your bathtub to ensure it won’t damage its finish.

There are a few ways to check whether your tub is fiberglass or acrylic. If your tub is a color other than white, then your tub is likely acrylic (as fiberglass tubs are usually white). Check to see if there is discoloration on the bottom of the tub, because if it’s yellowed, then you can be fairly sure it’s fiberglass.

Also, fiberglass tubs have thinner edges and are cool to the touch. Acrylic, on the other hand, is either room temperature or warm to the touch.

Rust in your bathtub occurs when iron in the water or on metal components in your tub are exposed to oxygen, but while it’s unsightly, it won’t make bathing dangerous. However, if the rust appears under or around your tub spout or shower head, it could indicate that you have high levels of iron in your water. Drinking water with small amounts of iron in it usually doesn’t pose a health risk, but you might want to consider installing a water softener. The presence of iron could indicate that you have hard water, which can create some plumbing issues.

Rust should be pretty easy to identify in your bathtub, as it has a dark red, brownish color, and it sits on the surface of the porcelain. It usually appears around metal fixtures, like under your tub spout or shower head, and you might also find it under metal shaving cream cans or razors that you leave sitting on the tub or a shower shelf.