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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.

It is best to wear a respirator during the sanding, painting, and sealing process. It can filter particles, vapors, and fumes that can be toxic to breathe. So it’s better to be safe and protect your lungs during this project.

Before you begin caulking a shower, you’ll need to use a utility knife or solvent to remove the old caulk and inspect the area for mold. If needed, take appropriate steps to get rid of the mold, then wipe everything down with dish soap and warm water before letting it dry completely. Finally, surround the caulking area with two strips of blue painter’s tape—one above the joint where you’re caulking and another below it.

Resurfacing a tub is worth it if there are just a few dings, scratches, or chips. Expect to pay about $330 to $630 to refinish a tub. You can restore your tub to looking brand new for less money than replacing the tub. But you're better off replacing old bathtubs with heavy damage, mold, or other major issues.