FIBELASTIC PLASTER 21 is elastomeric hydraulic mineral based internally cross-linked acriurethane modified microfibers reinforced Class A4 crack bridging, which can be simply applied by mixing a prepacked dry-mix powder with a formulated flexible acriurethane admixture and subsequent brushing the slurry. It protects a wide range of buildings and structural concrete components with excellent resistance to water, aggressive chemicals, long-term weathering and scratching. It is applicable for those structures subjected to long-term water immersion.