Single component, solvent-free bitumen emulsion modified with synthetic rubber. After dilution with water, it is used as a priming agent (for concretes, brick walls, ceilings, terraces, roof slopes, etc.) for waterproofing coatings made of Dysperbit, Styrbit 2000, heat-weldable tar papers and other coating materials. It is also used for priming rockwool before bonding to substrates.