Sealant with siloxaphobic surface, composition, and method to prepare same

A method comprising, under conditions to exclude moisture from contacting ingredients,

• (1) mixing a fluorocarbon alcohol containing per molecule at least one fluorocarbon group of the formula C.sub.x F.sub.(2x+1 -- in which x has an average value of at least 6 and a hydrolyzable silane of the average general formula
• R.sub.(4-c) SiY.sub.c
• wherein R is a monovalent hydrocarbon radical, c has an average value of from 2 to 4 inclusive and Y is a hydrolyzable group selected from the group consisting of ketoximo, alkoxy, acyloxy, alkenyloxy, and amido, make a mixture where there is at least 0.01 mole of fluorocarbon alcohol per one mole of hydrolyzable silane molecule,
• 92) heating the mixture of (1) until some of the fluorocarbon alcohol reacts with the hydrolyzable silane wherein a C--O--Si bond is formed and a reaction mixture of the hydrolyzable silane and the fluorocarbon alcohol results and comprises, unreacted fluorocarbon alcohol, unreacted hydrolyzable silane and a reaction product of the hydrolyzable silane and the fluorocarbon alcohol, and
• (3) mixing the produce of (2) with a room temperature curing elastomeric polyorganosiloxane composition in an amount such that there is from 0.1 to 7 weight percent of the fluorocarbon group based on the total weight of the composition to make a room temperature curing sealant which produces a siloxaphobic surface when cured by exposure to atmospheric conditions.