Caulk Caulking a shower

Published on January 15th, 2017 | by Henri

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Caulking a fiberglass shower

Q.  Five years ago I installed a Masco corner bath shower. It is constructed of white — I’m guessing — fiberglass.

After about three years of use, the caulking, especially around the area that gets the wettest turned a yellowish-orange color, so I removed and replaced it. It has changed color again and needs to be replaced. Some of the caulking I used did not stick very well and became loose. I used the caulking suggested by the manufacturer.

What would you suggest I use to clean the area after I remove the caulk so that it would adhere to the fiberglass better? Do you have a suggestion for a caulk that will not stain? We are on a well, but have a softener, but not sure if the staining is rust or mold. Thank you.

A.  If there is any caulking remnant, you can break the bond between the caulk and the surfaces to which it is applied with a utility knife, being careful not to scratch the surface, and then peel the caulking bead off.

Once the caulking has been removed, you will have to clean the area thoroughly with either alcohol or mineral spirits, using an abrasive pad to remove any remnants of the old caulk to ensure proper adhesion.

There are several brands of caulking compounds that guarantee they will not mildew: Sashco Mildew Free Sealant is guaranteed for seven years and will pay labor and materials to replace it if it fails within that time frame; GE Supreme Silicone Kitchen & Bath; DAP Kwik Seal 3.0 Advanced Caulk With Microban is silicone-based and advertised as mildew-proof; Locktite-U Can Seal white caulk was recommended by a reader who also said that a small amount of mildew developed after awhile, which he easily removed with bleach and water.

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