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To seal off, or encapsulate, asbestos-containing materials in your home, you’ll need to utilize a sealant specifically designed for asbestos encapsulation. These sealants bind with asbestos fibers to keep them from spreading throughout the air and causing bodily harm. In many cases, these sealants can be simply painted on, but you’ll need to wear a protective body suit as well as an asbestos-rated respirator to interact with these materials safely.

While there are some sealants designed to be spray-painted over asbestos to encapsulate it, you still want to make sure it’s a specifically designed product for this purpose—not just run-of-the-mill spray paint. Furthermore, be sure you aren’t inadvertently spraying the asbestos fibers around when you take on this project, and as always, be sure to wear the proper protective gear, including a P-100-rated respirator and a disposable body suit, so as not to inadvertently breathe in or spread asbestos fibers.

Asbestos encapsulation is an alternative to asbestos abatement or removal. Suppose you have hired an asbestos testing service and they recommend encapsulation. In that case, they will cover the asbestos with a protective barrier or put it in a sealed enclosure so the fibers cannot escape. Encapsulation usually costs between $2 and $6 per square foot.

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.