Collacral VAL Solution of vinylpyrrolidone copolymer BASF Flow / Levelling agent Coatings >> Waterborne Architectural / Decorative Water Collacral VAL. Aqueous solution of vinylpyrrolidone copolymer (approx. 30%). Good flow and levelling. Also acts as protective colloid; for emulsion paints (co-thickener). Good flow and levelling. Also acts as protective colloid; for emulsion paints (co-thickener).