This viscous substance hardened quickly as it was applied onto the surfaces it was meant to preserve. Asbestos fibers were included into sealers’ formulas in order to increase their durability and ability to resist to extreme heat.
Regarding asbestos sealers, the risk of exposure to asbestos fibers was related to the state of friability the product was found in after it was applied and left for a long period of time. With the passing of time, this construction material usually got damaged by external factors like weather conditions that made the asbestos particles become airborne. You could have been exposed if: