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How to Remove Mastic Sealant

Updated April 17, 2017

Mastic sealant is often used in areas where there is a need for flexibility and a moisture-resistant seal. Mastic sealant is flexible, pliant and waterproof. It is also very easy to install. This makes it the ideal seal for areas such as bathtubs, showers, sinks and bathroom floors. Getting mastic sealant up again is a bit of a task, but using easy-to-find items should make the job simple, and will save you money because you are doing it yourself.

Wash the area thoroughly with an all-purpose cleaner and a scrub brush, so there is as little dirt as possible on the mastic sealant. Allow it to dry, and leave the area unused for 48 hours.

Burrow the tip of a utility knife or scraper underneath an edge of the sealant. Begin to peel away the sealant. Hold the blade flat under the surface of the sealant, and inch your way around.

Prepare a garbage bag with a seal or good closure. As you get the mastic off the surface, place it into the garbage bag. When you are through, seal the bag well before disposing of it.

Pour some white spirit onto a microfiber cloth, and use the cloth to rub any marks or stubborn bits of mastic that remain on the surface.

With a dry microfiber cloth, thoroughly dry the surface where the old mastic was removed, and any area touching it. Dry this area again before putting on a new sealant.

Tip

Keep areas with mastic sealant dry and clean for longer-lasting seal.

Warning

Use chemicals in a well-ventilated area.

Things You'll Need

  • All-purpose cleaner
  • Scrub brush
  • Utility knife or small scraper
  • Microfiber cloths
  • White spirit
  • Garbage bags
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About the Author

Based in New York, Tim Burgone has been writing technology-related content since 1991. His work has appeared in “Wired” magazine and “Mac Addict” magazine. Burgone received the Frank L. Kern Literary Award in 2002. He holds a Bachelor of Fine Arts from St. John’s University in New York.