Caulk in Colours™ acrylic sealant is a premium quality flexible, joint sealant for use in sealing expansion joints and gaps in construction work and tiling. It can be used for interior and exterior joint sealing where a water and mould resistant sealant is required that also has good UV resistance. Caulk in Colours™ dries “true” to its wet colour and resists long term splitting and cracking.