RYOT4 C. Hardener is Non –metallic dry shake economical Colored Floor hardener for coloring and hardening concrete flat work, resulting hard, non-slip, non-rust surfaces for both interior and exterior. It is applied by the dry shake method onto wet and new screed which ensures that hard wearing surface bonds monolithically to the base concrete. It is specially formulated for use in stamping concrete, textured and imprinted concrete paving and flooring..