The fatty polyamines can have the formula R1???(NH???R2)x???NH2 where R1 is a linear or branched alkyl group having about 8-40 carbon atoms, such as about 10-35 carbon atoms, or about 12-18 carbon atoms; R2 is a divalent moiety having 1 to about 8 carbon atoms, such as about 2-6 carbon atoms, or about 2-4 carbon atoms; and x is about 1-6, such as about 1-4.