Silanes blend

A reactive composition comprising

• (a) at least two different fluorosilanes each of the same general formula I
• Rtf—SiX3 (formula I),
• wherein
• X is selected from the group of alkoxy, halide, oxime, carboxyl, phenoxide and polyether, and
• Rtf is a straight, branched or cyclic residue of the general formula II or III
• —Y—Rf (formula II) or
• —Y—(SiR1R2O)xSiR1R2—Y—Rf (formula III),
• wherein
• Y is a moiety selected from the group of —(CH2)n—, —CO2—, —O—, —CONH—, —Ph—, —SO2—, and —SO2NH—, —(CH2)o—O—(CH2)m, —(CH2)o—CONH—(CH2)m, —(CH2)o—Ph—(CH2)m, —(CH2)oSO2—(CH2)m, —(CH2)o—SO2NH—(CH2)m, —SO2—O— and —SO2NH—, wherein o is an integer from 1 to 30, m is a number in the range from 0 to 30 and, wherein n is an integer from 1 to 30,
• Rf is a C2 to C7 linear or branched perfluoralkylene group, wherein the fluorosilanes differ in their number of carbon atoms in Rf at least by 2,
• R1 and R2 are independently selected from monovalent organic residues,
• x is an integer from 0 to 5, and
• (b) and at least one aminosilane of the general formula IV
• Ra—SiR3R4R5 (formula IV),
• where
• Ra is a straight, branched or cyclic alkyl residue comprising 1 to 7 carbon atoms and at least one primary, secondary, ternary or quaternary amino-group,
• R3 and R4 are independently selected from —Ra, —OR6 and/or —R6, and
• R5 is —OR6, and
• R6 is a straight, branched or cyclic alkyl residue comprising 1 to 3 carbon atoms.