The invention relates to a sealing strip used in the spray-painting of two adjacent surfaces separated by a tooled joint. The invention is formed by an elastomer body (1) that is used to fill the joint. The upper end of said body is wider than the joint and is in contact with the inner face of the door (3) in order to define a painting boundary along the inner rim of the edge of the door (7), thereby enabling the outer rim (6) and the edge of the door to be painted. The aforementioned elastomer sealing body (1) includes a lateral adhesive sheet (2) which projects out from the surface in order to define a painting boundary along the outer rim (5) of the frame (4) to which the sheet is affixed by means of an adhesive in order to secure the assembly. The invention also relates to a method for producing said sealing strip.