Fumed Silica (Cab-O-Sil)
Cab-o-Sil or fumed silica, used for altering the properties of resin to change thixotropy, add viscosity or increase bond strength. Use to prevent draining from glue joints or on vertical surfaces. Use in combination with other fillers to improve working properties and minimize draining with polyester and epoxy resins. Use with resin or gel coat to make a patching paste or putty.