ALEX PLUS Acrylic Latex Caulk with Silicone is a professional quality caulking product designed to last. It is an all-purpose adhesive caulk ideal for a wide variety of interior and exterior applications. ALEX PLUS contains silicone, which allows for excellent adhesion and flexibility to resist expansion and contraction without cracking. It provides a watertight seal and prevents air and moisture from passing through cracks and joints, improving energy efficiency. Cured caulk is mildew resistant. ALEX PLUS is paintable with latex and oil-based paints, is easy to use, easy to handle, low in odor, cleans easily with soap and water, and has a low VOC content.