Abstract: Disclosed herein is a silane-functional hardener for carboxyl-functional resins including at least one monomer and/or oligomer and/or polymer having at least one group represented by Formula I-(a) and/or Formula I-(b) and at least one group represented by Formula II-(a) and/or Formula II-(b): where, R1, R2 and R3 independently represent a C1-C18 alkyl group, C1-C6 alkoxyl group, phenyl group, aryl group, hydrogen atom, chlorine atom or fluorine atom and at least one of R1, R2 and R3 is a C1-C6 alkoxyl group, R4 represents a C1-C18 alkyl group, C1-C6 alkanol group, C1-C6 alkoxyl group, or hydrogen atom, R5 represents a hydrogen atom, C1-C18 alkyl group, or C1-C6 alkoxyl group, R6 represents a C2-C6 acyl group, C1-C18 alkylene group or arylene group and R7 represents a —NR4— group, C2-C6 acyl group, C1-C18 alkylene group, C1-C18 alkoxy group or arylene group.