index an index number more or less than one indicates that the finish is causing acceleration of resin gelling and will probably cause capillary voids or silver streaks in actual laminates an index number greater than one indicates that the finish is lengthening the gel time and is less likely to cause capillary voids in an actual laminate finish description gel time index none 1 0 three silanes table 1 1 35 three silanes 1 boric acid 1 54 three silanes 2 boric acid 1 62 one half the amount of the three 1 79 silanes 2 boric acid while the example above utilizes an epoxy resin system containing an imidazole catalyst boric acid and dicyandiamide as curing agent the finishes of this invention have wide spread additional applications we have determined that cationic amino silane finishes on fiberglass fabrics have a catalytic effect on the cure of epoxy resin systems and that this effect is additive to the effect of a catalyst in the resin system we have also determined that it is advantageous to selectively extend the gel time of epoxy resin in the capillaries between fiberglass filaments in a multi filament yarn to insure sufficient flow to eliminate voids therefore the invention has the following applications in epoxy resin systems containing only epoxy resin and curing agent to latently block the catalytic effect of the amino silane in the finish to provide sufficient capillary resin flow to achieve a void free laminate in epoxy resin systems containing a catalyst.