Five Star Structural Concrete® Gunite S300 is a dry process shotcrete applied, high strength, permanent concrete repair material. Five Star Structural Concrete® Gunite S300 may be used from 1/4 inch (6 mm) to deep/full depth applications and provides a long finishing time. Five Star Structural Concrete® Gunite S300 provides increased corrosion protection of steel reinforced structures with migrating corrosion inhibitor technology and very low chloride ion permeability.