A surgical stapler end effector assembly, the end effector assembly comprising: (a) a staple cartridge , wherein the staple cartridge comprises: (i) a plurality of staples , and (ii) a deck , wherein the staple cartridge is operable to drive the staples through the deck; (b) an anvil , wherein the anvil is movable from an open position toward the staple cartridge to reach a closed position, wherein the anvil includes an underside having staple forming surface configured to receive staples driven through the deck; and (c) a buttress assembly, wherein the buttress assembly comprises: (i) a buttress body , and (ii) an adhesive material , wherein the adhesive material is configured to removably secure the buttress body to the deck of the staple cartridge or the underside of the anvil, wherein the adhesive material comprises a polymer, wherein the polymer is bioabsorbable, wherein the polymer is in a flowable state on the buttress body; characterized in that : (i) the deck of the staple cartridge defines a trough , wherein at least some of the flowable polymer is contained in the trough; and/or in that : (ii) the surgical stapler end effector assembly further comprises a retainer , wherein the retainer is configured to releasably hold the buttress assembly, wherein the adhesive material is provided in a plurality of discrete regions, wherein the retainer comprises a plurality of projections configured to engage the buttress body at a plurality of discrete locations associated with the discrete regions to thereby provide focused pressure on the buttress assembly at the discrete regions. (a) a staple cartridge , wherein the staple cartridge comprises: (i) a plurality of staples , and (ii) a deck , wherein the staple cartridge is operable to drive the staples through the deck; (i) a plurality of staples , and (ii) a deck , wherein the staple cartridge is operable to drive the staples through the deck; (b) an anvil , wherein the anvil is movable from an open position toward the staple cartridge to reach a closed position, wherein the anvil includes an underside having staple forming surface configured to receive staples driven through the deck; and (c) a buttress assembly, wherein the buttress assembly comprises: (i) a buttress body , and (ii) an adhesive material , wherein the adhesive material is configured to removably secure the buttress body to the deck of the staple cartridge or the underside of the anvil, wherein the adhesive material comprises a polymer, wherein the polymer is bioabsorbable, wherein the polymer is in a flowable state on the buttress body; (i) a buttress body , and (ii) an adhesive material , wherein the adhesive material is configured to removably secure the buttress body to the deck of the staple cartridge or the underside of the anvil, wherein the adhesive material comprises a polymer, wherein the polymer is bioabsorbable, wherein the polymer is in a flowable state on the buttress body; (i) the deck of the staple cartridge defines a trough , wherein at least some of the flowable polymer is contained in the trough; and/or in that : (ii) the surgical stapler end effector assembly further comprises a retainer , wherein the retainer is configured to releasably hold the buttress assembly, wherein the adhesive material is provided in a plurality of discrete regions, wherein the retainer comprises a plurality of projections configured to engage the buttress body at a plurality of discrete locations associated with the discrete regions to thereby provide focused pressure on the buttress assembly at the discrete regions. <EOS>