II. An aqueous coating composition formed by combining or mixing (A) at least one silane of the formula (1) R1Si(OR2)3???(1) wherein R1 is a lower alkyl group, a C6-C8 aryl group or an N-(2-aminoethyl)-3-aminopropyl group, and R2 is a lower alkyl group; (B) an acid component selected from the group consisting of water-soluble organic acids, H3BO3 and H3PO3; and (D) water.