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No, but it’s common that they do. Gravity furnaces weren’t terribly efficient so wrapping either the ductwork in asbestos, the furnace itself, or both, was something done regularly. This allowed the system to retain more heat. At the time, this greatly enhanced the efficiency of the furnaces but it wasn’t until later that we became aware of just how carcinogenic and dangerous asbestos could be.

Asbestos-containing materials, like duct wrap, should be encapsulated using a sealant specifically formulated for asbestos. These sealants work to bind with asbestos fibers and help further neutralize them as a health risk. Whenever you’re working near asbestos-containing materials, be sure to keep safety as a top priority and wear a P-100-rated respirator as well as protective clothing.

You are not really supposed to seal asbestos with paint, but in theory it could work—the caveat being that this is extremely dangerous and should be avoided at all costs. The only real way to seal asbestos is with the professional application of an encapsulating material like epoxy. Due to the negative effect asbestos can have on your home, however, it is usually the best course of action to accept a costly fix and remove the material entirely.

Epoxying over asbestos tiles is generally considered a safe option when done correctly. Epoxy acts as a sealant, encapsulating the asbestos tiles and preventing the release of asbestos fibers into the air. The key is ensuring that the asbestos tiles are in good condition, firmly adhered to the substrate, and not damaged or deteriorating. This method is only appropriate for tiles that are undamaged and securely in place. If the asbestos tiles are already loose, damaged, or deteriorating, encapsulating them with epoxy may not be a sufficient solution, as it might not address the potential for ongoing asbestos exposure.