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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.

According to the Environmental Protection Agency (EPA), hazardous waste is generally classified into four main categories:

1. Characteristic Wastes: These exhibit at least one of four hazardous traits: ignitability (flammable, like gasoline), corrosivity (can rust or decompose materials, like car batteries), reactivity (unstable and can explode, like aerosol cans), or toxicity (harmful when ingested, like lead-based paint).

2. Listed Wastes: These are specific wastes from manufacturing and industrial processes that the EPA has officially designated as hazardous. They include byproducts from processes that use solvents, pesticides, and other chemicals.

3. Universal Wastes: These are commonly generated hazardous items that are subject to streamlined regulations. Examples include batteries, pesticides, mercury-containing equipment (e.g., bulbs), and some lamps.

4. Mixed Wastes: This category includes waste that contains both hazardous and radioactive components, making it subject to regulation by both the EPA and the Nuclear Regulatory Commission.

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.