As a single-component, solvent-based bitumen rubber mastic joint sealant, the Bitumastic is a sealant that forms a tough and flexible seal upon curing. It provides excellent adhesion to concrete, brickwork, asphalt, and most construction material substrates. In order to make the sealant thixotropic and slump-free when applied on vertical areas, the mastic sealant is modified with non-asbestos fibres.