be used as condensation catalysts for the dispersions of this invention are especially the salts of carboxylic acids and the halides of the metals pb zn zr ti sb fe cd sn ba ca and mn organo tin compounds of carboxylic acids having from 1 to 18 carbon atoms and organo tin halides especially organo tin naphthenates octoates hexoates laurates acetates bromides and chlorides are the preferred catalytic compounds specific examples of organo tin compounds are tin ii octoate dibutyltin dilaurate octyltin triacetate dioctyltin dioctoate dioctyltin diacetate didecyltin diacetate dibutyltin diacetate dibutyltin dibromide dioctyltin dilaurate and trioctyltin acetate diorganotin dicarboxylates especially dibutyltin dilaurate dioctyltin dilaurate dibutyltin diacetate and dioctyltin diacetate are the preferred organo tin compounds siliconates which can be used in the dispersions of this invention are preferably those of the formula and or condensation products thereof formed by the elimination of water where r 39 is the same as r preferably r 39 is a hydrocarbon radical which has from 1 to 10 carbon atoms and may be halogenated or contain an amine group more preferably r 39 is a hydrocarbon radical having from 1 to 6 carbon atoms or an aminoalkyl radical m is a whole or fractional number having a value of from 0 1 to 3 and m is an alkali metal cation or an ammonium or phosphonium group the examples of.