Abstract: Isocyanate-free coating compositions, capable of forming a durable coating under ambient conditions, are claimed comprising(A) at least one polymer, oligomer or combinations thereof selected from the group consisting of acrylic, urethane and urea polymers and oligomers having a number average molecular weight of at least about 100 and bearing at least two aziridinyl groups defined by the following structural formula: ##STR1## wherein X represents O, S, NH, NR, wherein R represents an alkyl having from one to 12 carbon atoms, or higher, or phenyl,R.sub.1 represents (CH.sub.2)m.sub.1, m.sub.1 being an integer ranging from 1 to 3 andR.sub.2 represents H, CH.sub.