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KÖSTER Mortar Tight is an additive for the on-site production of plaster, screed, or simple sealing slurry made of sand, cement, and water. KÖSTER Mortar Tight replaces a portion of the mixing water.
It improves the density of the mortar structure, makes the mortar water repellent (hydrophobic) and promotes the self-healing of micro-cracks through crystallization. This makes the mortar waterproof and reduces capillary absorbency. KÖSTER Mortar Tight can be used indoors and outdoors.
