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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.

You can use other ways to seal the space where your tub and the bathroom tile meet. Using sealant tape, epoxy sealer, and spray foam can be just as effective as caulking your bathtub. When using alternatives to caulk, the one that is best for you depends on your preferences. 

Sealant tape takes less time and effort to use, which is why some homeowners prefer it. Meanwhile, epoxy sealer creates a smooth and glossy finish that can complement your bathroom. Lastly, spray foam is waterproof and can act as insulation for your tub.

Bathtub refinishing costs an average of $460 and includes removing the finish, sanding or acid etching the surface, priming it, and applying an epoxy coating. After the coating cures, the bathtub should look as good as new, and the finish should last between seven and 10 years. Because bathtub refinishing requires hazardous chemicals, you should call a bathtub refinisher to do the job.

Reglazing a bathtub can last as few as three years and up to 15 years. With proper application, the recoated surface is as durable as a brand-new tub. Clean your tub properly and avoid using abrasive cleaners to maintain the coating. If the weather conditions were cold or humid during resurfacing or the tub was significantly damaged, the reglazing may not last as long.