The present invention provides low tack, low temperature flexible aqueous caulk or sealant compositions comprising multistage aqueous emulsion copolymers having a hard stage and a soft stage, the soft stage including, in copolymerized form, one or more nonionic monomers and (i) methacrylic acid (MAA) or a salt thereof and a second acid monomer having a lower pKa than methacrylic acid or a salt thereof, or (ii) a copolymer having a mixture of acid or salt groups and hydroxyl groups, the acid groups chosen from, in copolymerized form, MAA and the second acid monomer, or salts thereof; and the hard stage having a weight average molecular weight (Mw) by gel permeation chromatography (GPC) against polystyrene standards of from 20,000 to 70,000.