BLOK® Universal Acrylic Caulk is one-component multi-purpose Acrylic Sealant. Suitable for filling cracks and joints both indoors and outdoors. Properties: Paintable. Can be used on all porous surfaces such as brick, concrete, wood etc. Suitable for joints with moderate movement (up to %15). Very easy to apply and clean. Water-proof after curing. Resistant to weathering such as rain, snow and sunlight.