Method for manufacturing a composite part (100, 200, 300, 400, 500, 600, 700, 800) for covering, sealing, trimming, or retaining a component (11, 12, 14, 15) of a vehicle, the composite part (100, 200, 300, 400, 500, 600, 700, 800) having: a main body (110, 210, 310, 410, 510, 610, 710, 810) defining a vehicle side surface and having an end portion (119, 121) being configured to engage the vehicle in a mounted state, the end portion (119, 121) being configured to be pressed towards the vehicle by a force resulting from bending elasticity of the main body (110, 210, 310, 410, 510, 610, 710, 810) in the mounted state; a mounting pin (130, 230, 330, 430, 530, 630, 730, 830) being configured to engage in a form fitting manner; and a wing sealing lip (341, 342, 441, 442); wherein the method comprises the steps of: 1.1 extrusion molding of the main body (110, 210, 310, 410, 510, 610, 710, 810) from a first polymer; 1.2 injection molding of the mounting pin (130, 230, 330, 430, 530, 630, 730, 830) from a second polymer having a higher formability than the first polymer, so as to integrally bond the mounting pin (130, 230, 330, 430, 530, 630, 730, 830) to the main body (110, 210, 310,410, 510,610, 710, 810) on the side of the vehicle side surface; and 1.3 injection molding of the wing sealing lip (341, 342, 441, 442) simultaneously with step 1.2, so as to integrally bond the wing sealing lip (341, 342, 441, 442) to the end portion (119, 121). a main body (110, 210, 310, 410, 510, 610, 710, 810) defining a vehicle side surface and having an end portion (119, 121) being configured to engage the vehicle in a mounted state, the end portion (119, 121) being configured to be pressed towards the vehicle by a force resulting from bending elasticity of the main body (110, 210, 310, 410, 510, 610, 710, 810) in the mounted state; a mounting pin (130, 230, 330, 430, 530, 630, 730, 830) being configured to engage in a form fitting manner; and a wing sealing lip (341, 342, 441, 442); wherein the method comprises the steps of: 1.1 extrusion molding of the main body (110, 210, 310, 410, 510, 610, 710, 810) from a first polymer; 1.2 injection molding of the mounting pin (130, 230, 330, 430, 530, 630, 730, 830) from a second polymer having a higher formability than the first polymer, so as to integrally bond the mounting pin (130, 230, 330, 430, 530, 630, 730, 830) to the main body (110, 210, 310,410, 510,610, 710, 810) on the side of the vehicle side surface; and 1.3 injection molding of the wing sealing lip (341, 342, 441, 442) simultaneously with step 1.2, so as to integrally bond the wing sealing lip (341, 342, 441, 442) to the end portion (119, 121). 1.1 extrusion molding of the main body (110, 210, 310, 410, 510, 610, 710, 810) from a first polymer; 1.2 injection molding of the mounting pin (130, 230, 330, 430, 530, 630, 730, 830) from a second polymer having a higher formability than the first polymer, so as to integrally bond the mounting pin (130, 230, 330, 430, 530, 630, 730, 830) to the main body (110, 210, 310,410, 510,610, 710, 810) on the side of the vehicle side surface; and 1.3 injection molding of the wing sealing lip (341, 342, 441, 442) simultaneously with step 1.2, so as to integrally bond the wing sealing lip (341, 342, 441, 442) to the end portion (119, 121).