A method of removing a wellbore isolation device comprising: contacting or allowing the wellbore isolation device to come in contact with an electrolyte, wherein a manufacturing process of the wellbore isolation device includes casting and excludes powder compaction and sintering, wherein at least a portion of the wellbore isolation device comprises pieces of a first material , pieces of a second material , and a third material , wherein the first material : (A) is a metal or a metal alloy; and (B) partially or wholly dissolves when an electrically conductive path exists between the first material and the second material and at least a portion of the first and second materials are in contact with the electrolyte, wherein the second material is a metal or metal alloy, wherein the first material and the second material form a galvanic couple and wherein the first material is the anode and the second material is the cathode of the couple, and wherein the third material physically separates at least a portion of a surface of one or more pieces of the first material from at least a portion of a surface of one or more pieces of the second material ; and allowing at least some of the pieces of the first material to dissolve, wherein the third material is a bonding agent for bonding the pieces of the first and second materials together. contacting or allowing the wellbore isolation device to come in contact with an electrolyte, wherein a manufacturing process of the wellbore isolation device includes casting and excludes powder compaction and sintering, wherein at least a portion of the wellbore isolation device comprises pieces of a first material , pieces of a second material , and a third material , wherein the first material : (A) is a metal or a metal alloy; and (B) partially or wholly dissolves when an electrically conductive path exists between the first material and the second material and at least a portion of the first and second materials are in contact with the electrolyte, wherein the second material is a metal or metal alloy, wherein the first material and the second material form a galvanic couple and wherein the first material is the anode and the second material is the cathode of the couple, and wherein the third material physically separates at least a portion of a surface of one or more pieces of the first material from at least a portion of a surface of one or more pieces of the second material ; and wherein the first material : (A) is a metal or a metal alloy; and (B) partially or wholly dissolves when an electrically conductive path exists between the first material and the second material and at least a portion of the first and second materials are in contact with the electrolyte, (A) is a metal or a metal alloy; and (B) partially or wholly dissolves when an electrically conductive path exists between the first material and the second material and at least a portion of the first and second materials are in contact with the electrolyte, wherein the second material is a metal or metal alloy, wherein the first material and the second material form a galvanic couple and wherein the first material is the anode and the second material is the cathode of the couple, and wherein the third material physically separates at least a portion of a surface of one or more pieces of the first material from at least a portion of a surface of one or more pieces of the second material ; and allowing at least some of the pieces of the first material to dissolve, wherein the third material is a bonding agent for bonding the pieces of the first and second materials together. <EOS>