Mastic is a sealing agent or glue used in construction practices to bond, isolate or waterproof two opposing surfaces. It comes in a variety of colours but is generally viscous and has a sticky, smooth texture. Some applications are: flooring adhesives, gap/crack sealants and asphalt bridging/repair. Asbestos was added to some mastic to increase the tensile strength and add fire resistance. Some construction mastics will degrade and become friable (can be crushed by hand pressure) while others will remain in the same condition for many years. Prior to any asbestos containing mastic removal a qualified person must complete a hazardous materials survey, which includes all mastics in area up for renovation or demolition. Overlooking asbestos containing mastics is common for unqualified inspectors/abatement contractors, ensure they are properly trained.