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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.

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.

If you don’t caulk your bathtub, then there won’t be a watertight seal between your bathtub and the wall tile surrounding it. As a result, water can seep into the wall and the floor and cause the perfect breeding grounds for mold and mildew. Not only does this require costly repairs, but mold can be harmful to those breathing it. 

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.