A film-forming thermoset coating composition, comprising: (a) an aqueous medium; and Option 1 and/or Option 2 as follows: Option 1: polyurethane-acrylate core-shell particles comprising a polymeric acrylic core at least partially encapsulated by a polymeric shell comprising urethane linkages, wherein the polymeric shell comprises an acid functional group and two or more hydrazide functional groups, wherein the polymeric shell is covalently bonded to at least a portion of the polymeric core; and (i) formaldehyde; (ii) polyformaldehyde; and/or (iii) a compound that generates formaldehyde, wherein the total amount of formaldehyde present and/or generated in is in the range of 0.1 to 3 weight %, based on total resin solids of the coating composition; Option 2: polyurethane-acrylate core-shell particles comprising a polymeric acrylic core at least partially encapsulated by a polymeric shell comprising urethane linkages, wherein the polymeric shell comprises an acid functional group and two or more N-methylolated hydrazide functional groups, wherein the polymeric shell is covalently bonded to at least a portion of the polymeric core. (a) an aqueous medium; and Option 1 and/or Option 2 as follows: Option 1: polyurethane-acrylate core-shell particles comprising a polymeric acrylic core at least partially encapsulated by a polymeric shell comprising urethane linkages, wherein the polymeric shell comprises an acid functional group and two or more hydrazide functional groups, wherein the polymeric shell is covalently bonded to at least a portion of the polymeric core; and (i) formaldehyde; (ii) polyformaldehyde; and/or (iii) a compound that generates formaldehyde, wherein the total amount of formaldehyde present and/or generated in is in the range of 0.1 to 3 weight %, based on total resin solids of the coating composition; Option 2: polyurethane-acrylate core-shell particles comprising a polymeric acrylic core at least partially encapsulated by a polymeric shell comprising urethane linkages, wherein the polymeric shell comprises an acid functional group and two or more N-methylolated hydrazide functional groups, wherein the polymeric shell is covalently bonded to at least a portion of the polymeric core. Option 1: polyurethane-acrylate core-shell particles comprising a polymeric acrylic core at least partially encapsulated by a polymeric shell comprising urethane linkages, wherein the polymeric shell comprises an acid functional group and two or more hydrazide functional groups, wherein the polymeric shell is covalently bonded to at least a portion of the polymeric core; and (i) formaldehyde; (ii) polyformaldehyde; and/or (iii) a compound that generates formaldehyde, wherein the total amount of formaldehyde present and/or generated in is in the range of 0.1 to 3 weight %, based on total resin solids of the coating composition; polyurethane-acrylate core-shell particles comprising a polymeric acrylic core at least partially encapsulated by a polymeric shell comprising urethane linkages, wherein the polymeric shell comprises an acid functional group and two or more hydrazide functional groups, wherein the polymeric shell is covalently bonded to at least a portion of the polymeric core; and (i) formaldehyde; (ii) polyformaldehyde; and/or (iii) a compound that generates formaldehyde, wherein the total amount of formaldehyde present and/or generated in is in the range of 0.1 to 3 weight %, based on total resin solids of the coating composition; Option 2: polyurethane-acrylate core-shell particles comprising a polymeric acrylic core at least partially encapsulated by a polymeric shell comprising urethane linkages, wherein the polymeric shell comprises an acid functional group and two or more N-methylolated hydrazide functional groups, wherein the polymeric shell is covalently bonded to at least a portion of the polymeric core. polyurethane-acrylate core-shell particles comprising a polymeric acrylic core at least partially encapsulated by a polymeric shell comprising urethane linkages, wherein the polymeric shell comprises an acid functional group and two or more N-methylolated hydrazide functional groups, wherein the polymeric shell is covalently bonded to at least a portion of the polymeric core.