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Grout Silicone Sealant 300 ml Professional-grade silicone sealant formulated for grout joints and tile applications. This 300 ml cartridge delivers superior adhesion and flexibility, creating a waterproof barrier that resists mildew and moisture penetration. Ideal for kitchens, bathrooms, and wet areas, it cures to a durable, paintable finish. Easy application with standard caulking guns. Maintains elasticity in temperature fluctuations while preventing grout deterioration and water damage behind tiles.