RYOT4 ALKALI BLOC is an alkali resistant waterborne exterior emulsion Alkali block primer, Based on acrylic copolymer emulsion to improve adhesion between wall and topcoat material. Its innovative technology delivers Excellent penetration into the substrate there by providing the best adhesion. Offers best protection against alkali attack, resists pealing or flaking of top core, Resistant to algae and fungus. Its latest pigment technology ensures excellent weather resistance and outdoor durability