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A transparent curing, low viscosity butadiene-styrene primer with a slightly sticky surface. KÖSTER SL Primer reduces the absorbency of mineral surfaces such as concrete and screed and equalizes differential absorbency rates in the substrate. It reduces the bubbling effect when working with KÖSTER self leveling floor products. KÖSTER SL Primer is solvent, plasticizer, and filler free. KÖSTER SL Primer is water resistant; it will not be washed or rained away after curing.