An abrasive rotary tool (100, 200, 300, 400, 500, 600) comprising: a tool shank (102, 202, 302, 402, 502, 602) defining an axis of rotation for the rotary tool (100, 200, 300, 400, 500, 600); and an abrasive external working surface (45, 106, 108, 116, 206, 208, 116, 206, 208, 216, 236, 238, 316, 416, 440, 516, 542, 544, 650, 654) coupled to the tool shank (102, 202, 302, 402, 502, 602), characterized in that the abrasive external working surface (45, 106, 108, 116, 206, 208, 116, 206, 208, 216, 236, 238, 316, 416, 440, 516, 542, 544, 650, 654) comprises: a resin; a plurality of porous ceramic abrasive composites dispersed in the resin, the porous ceramic abrasive composites comprising individual abrasive particles dispersed in a porous ceramic matrix, wherein at least a portion of the porous ceramic matrix comprises glassy ceramic wherein a ratio of the average porous ceramic abrasive composite size to the average individual abrasive particle size is no greater than 15 to 1; and an elastically compressible layer backing the abrasive external working surface (45, 106, 108, 116, 206, 208, 116, 206, 208, 216, 236, 238, 316, 416, 440, 516, 542, 544, 650, 654); wherein the abrasive external working surface (45, 106, 108, 116, 206, 208, 116, 206, 208, 216, 236, 238, 316, 416, 440, 516, 542, 544, 650, 654) is a coating disposed on a substrate; and wherein the porous ceramic abrasive composites represent between 35 percent to 65 percent by weight of the working surface (45, 106, 108, 116, 206, 208, 116, 206, 208, 216, 236, 238, 316, 416, 440, 516, 542, 544, 650, 654), based on the total weight of the resin and the porous ceramic abrasive composites. a tool shank (102, 202, 302, 402, 502, 602) defining an axis of rotation for the rotary tool (100, 200, 300, 400, 500, 600); and an abrasive external working surface (45, 106, 108, 116, 206, 208, 116, 206, 208, 216, 236, 238, 316, 416, 440, 516, 542, 544, 650, 654) coupled to the tool shank (102, 202, 302, 402, 502, 602), characterized in that the abrasive external working surface (45, 106, 108, 116, 206, 208, 116, 206, 208, 216, 236, 238, 316, 416, 440, 516, 542, 544, 650, 654) comprises: a resin; a plurality of porous ceramic abrasive composites dispersed in the resin, the porous ceramic abrasive composites comprising individual abrasive particles dispersed in a porous ceramic matrix, wherein at least a portion of the porous ceramic matrix comprises glassy ceramic wherein a ratio of the average porous ceramic abrasive composite size to the average individual abrasive particle size is no greater than 15 to 1; and an elastically compressible layer backing the abrasive external working surface (45, 106, 108, 116, 206, 208, 116, 206, 208, 216, 236, 238, 316, 416, 440, 516, 542, 544, 650, 654); wherein the abrasive external working surface (45, 106, 108, 116, 206, 208, 116, 206, 208, 216, 236, 238, 316, 416, 440, 516, 542, 544, 650, 654) is a coating disposed on a substrate; and wherein the porous ceramic abrasive composites represent between 35 percent to 65 percent by weight of the working surface (45, 106, 108, 116, 206, 208, 116, 206, 208, 216, 236, 238, 316, 416, 440, 516, 542, 544, 650, 654), based on the total weight of the resin and the porous ceramic abrasive composites. a resin; a plurality of porous ceramic abrasive composites dispersed in the resin, the porous ceramic abrasive composites comprising individual abrasive particles dispersed in a porous ceramic matrix, wherein at least a portion of the porous ceramic matrix comprises glassy ceramic wherein a ratio of the average porous ceramic abrasive composite size to the average individual abrasive particle size is no greater than 15 to 1; and an elastically compressible layer backing the abrasive external working surface (45, 106, 108, 116, 206, 208, 116, 206, 208, 216, 236, 238, 316, 416, 440, 516, 542, 544, 650, 654); wherein the abrasive external working surface (45, 106, 108, 116, 206, 208, 116, 206, 208, 216, 236, 238, 316, 416, 440, 516, 542, 544, 650, 654) is a coating disposed on a substrate; and wherein the porous ceramic abrasive composites represent between 35 percent to 65 percent by weight of the working surface (45, 106, 108, 116, 206, 208, 116, 206, 208, 216, 236, 238, 316, 416, 440, 516, 542, 544, 650, 654), based on the total weight of the resin and the porous ceramic abrasive composites.