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Bruce Wedlock replies: Epoxy fillers do not significantly change the strength of the epoxy. West System epoxy combines with 404 High Density Filler for optimum strength. Use 407 Low Density Filler for optimum volume or 406 Colloidal Silica Filler for optimum versatility. Filled epoxy will bridge large gaps and voids and can be easily sanded and shaped when cured.
