to use a preparation that will improve the fabric 39 s hydrolysis stability normally the thickened resin mixture includes dilution water an anti foaming agent surfactants a catalyst an acrylic latex thermal setting resins a thickner and an ammonium hydroxide neutralizer while it is preferable to use an acrylic latex in the resin system other conventional latexes may be used such as natural or synthetic rubber latexes vinyl acetates vinyl chlorides vinyl pyridines polyvinyl alcohols and resorcinol formaldehydes by adding a thickener the viscosity of the mixture is increased the ammonium hydroxide neutralizer serves as a base for activating the thickener one particular thickener which has been successfully employed is acrysol ase 60 sold by rohm amp haas company of philadelphia pa acrysol ase 60 is an acid containing cross linked acrylic emulsion copolymer when the emulsion is diluted with water and neutralized with the base each emulsion particle swells greatly the emulsion clarifies under such conditions and becomes highly viscous other thickeners can also be used such as starches polyvinyl alcohols cellulose gums carboxymethylcellulose and carboxypolymethylene resins a sufficient quantity of the thickener is added so as to significantly increase the viscosity in order to provide the desired thickened.