DAP Alex Plus all purpose acrylic latex caulk plus silicone is an excellent quality, all purpose caulk for sealing a wide variety of interior and exterior surfaces. It contains silicone additives for greater flexibility and adhesion and shrinks less for a durable, waterproof seal. Alex Plus is paintable in just 30 min with latex or oil based paints, saving time. It won't shine through or discolor the paint for superior paint finish results. It is easy to apply and tool, low in odor and cleans up easily with water. Cured caulk is mold and mildew resistant. 40 years. Exceeds ASTM C834. Interior/exterior use.