A caulking sealant has three basic functions: filling a gap between two or more substrates; forming a barrier through the physical properties of the sealant itself and by adhesion to the substrate; and maintaining sealing properties for the expected lifetime, service conditions, and environments. To help maintain flexibility at low temperatures and to retain performance, most pigmented acrylic latex sealants on the market today are formulated with a supplementary external plasticizer. When properly chosen and formulated, plasticizers such as benzylbutyl phthalate, dipropylene glycol dibenzoate or others effectively lower the glass-transition temperature (Tg) of acrylic polymers and thus “soften” the composition.