A device for repairing membranes coating metal pipes and metal storage tanks, comprising: a) a patch member having top and bottom surfaces, a protective outer wrap having an inner bottom surface and an outer bottom surface, the protective outer wrap including a recessed portion having a size and shape to receive therein the patch member such that said top surface of said patch member is in physical contact with said inner bottom surface of said recessed portion, a removable protective film applied to the bottom surface of said patch member; b) a patch applicator including i) a support member having a top surface, bottom surface, an aperture extending therethrough and an adhesive layer coated on said bottom surface and a removable protective film applied over said adhesive; ii) an arm having first and second end portions, said first end portion hingedly attached to said top surface of said support member and pivotally movable between a closed position and an open position, said outer bottom surface of said protective outer wrap member being detachably attached to a bottom surface of said second end portion of said arm, said arm having a length selected such that when in the closed position the patch member is generally centrally located in the aperture; and c) wherein in use said bottom surface of said support member is temporarily bonded on a membrane of a pipe or storage tank such that a defect in the membrane is generally centrally located within said aperture, said removable protective film applied to the bottom surface of said patch member is removed when the arm is in the open position to expose said bottom surface of said patch member and pivoting said arm to said closed position such that said bottom surface of said patch member covers the defect, and said protective outer wrap is detached from said bottom surface of said arm and said patch applicator is detached from said membrane to leave behind said patch member on said membrane which is covered by said protective outer wrap. a) a patch member having top and bottom surfaces, a protective outer wrap having an inner bottom surface and an outer bottom surface, the protective outer wrap including a recessed portion having a size and shape to receive therein the patch member such that said top surface of said patch member is in physical contact with said inner bottom surface of said recessed portion, a removable protective film applied to the bottom surface of said patch member; b) a patch applicator including i) a support member having a top surface, bottom surface, an aperture extending therethrough and an adhesive layer coated on said bottom surface and a removable protective film applied over said adhesive; ii) an arm having first and second end portions, said first end portion hingedly attached to said top surface of said support member and pivotally movable between a closed position and an open position, said outer bottom surface of said protective outer wrap member being detachably attached to a bottom surface of said second end portion of said arm, said arm having a length selected such that when in the closed position the patch member is generally centrally located in the aperture; and i) a support member having a top surface, bottom surface, an aperture extending therethrough and an adhesive layer coated on said bottom surface and a removable protective film applied over said adhesive; ii) an arm having first and second end portions, said first end portion hingedly attached to said top surface of said support member and pivotally movable between a closed position and an open position, said outer bottom surface of said protective outer wrap member being detachably attached to a bottom surface of said second end portion of said arm, said arm having a length selected such that when in the closed position the patch member is generally centrally located in the aperture; and c) wherein in use said bottom surface of said support member is temporarily bonded on a membrane of a pipe or storage tank such that a defect in the membrane is generally centrally located within said aperture, said removable protective film applied to the bottom surface of said patch member is removed when the arm is in the open position to expose said bottom surface of said patch member and pivoting said arm to said closed position such that said bottom surface of said patch member covers the defect, and said protective outer wrap is detached from said bottom surface of said arm and said patch applicator is detached from said membrane to leave behind said patch member on said membrane which is covered by said protective outer wrap.