A method for manufacturing a composite structure, the method comprising the following steps: a) providing at least two partially cured fiber reinforced polymer parts (110, 120); b) forming an ensemble by joining at least two partially cured FRP parts (110, 120) by bringing into contact a first bonding portion of a first partially cured FRP part with a second bonding portion of a second partially cured FRP part; c) providing a mold comprising a first mold part and a second mold part configured for coupling with each other, such that an inner chamber is defined when the first and second mold parts are coupled to each other, said inner chamber being configured for housing the ensemble inside, wherein the first mold part is provided with a first pressing surface, and the second mold part is provided with a second pressing surface, such that the first and second pressing surfaces are configured to be arranged facing each other when the first and second mold parts are coupled to each other; d) coupling the first and second mold parts such that the ensemble is housed within the inner chamber defined by said first and second mold parts, wherein the first pressing surface presses against the first bonding portion of the first partially cured FRP part, and the second pressing surface presses against the second bonding portion of the second partially cured FRP part, such that the pressure exerted by the first and second pressing surfaces presses the first and second bonding portions against each other; e) producing a vacuum in the inner chamber; and f) curing the ensemble under vacuum and temperature; characterised in that step b) comprises applying pressure to bring the first bonding portion and the second bonding portion into contact; and applying a partial curing cycle, wherein the partial curing cycle is performed: - at a lower temperature compared to a temperature adapted to complete a curing cycle according to which the partially cured FRP parts (110, 120) are completely cured, and/or - during a shorter time compared to a time adapted to complete a curing cycle according to which the partially cured FRP parts (110, 120) are completely cured. a) providing at least two partially cured fiber reinforced polymer parts (110, 120); b) forming an ensemble by joining at least two partially cured FRP parts (110, 120) by bringing into contact a first bonding portion of a first partially cured FRP part with a second bonding portion of a second partially cured FRP part; c) providing a mold comprising a first mold part and a second mold part configured for coupling with each other, such that an inner chamber is defined when the first and second mold parts are coupled to each other, said inner chamber being configured for housing the ensemble inside, wherein the first mold part is provided with a first pressing surface, and the second mold part is provided with a second pressing surface, such that the first and second pressing surfaces are configured to be arranged facing each other when the first and second mold parts are coupled to each other; the first mold part is provided with a first pressing surface, and the second mold part is provided with a second pressing surface, d) coupling the first and second mold parts such that the ensemble is housed within the inner chamber defined by said first and second mold parts, wherein the first pressing surface presses against the first bonding portion of the first partially cured FRP part, and the second pressing surface presses against the second bonding portion of the second partially cured FRP part, such that the pressure exerted by the first and second pressing surfaces presses the first and second bonding portions against each other; the first pressing surface presses against the first bonding portion of the first partially cured FRP part, and the second pressing surface presses against the second bonding portion of the second partially cured FRP part, e) producing a vacuum in the inner chamber; and f) curing the ensemble under vacuum and temperature; characterised in that step b) comprises applying pressure to bring the first bonding portion and the second bonding portion into contact; and applying a partial curing cycle, wherein the partial curing cycle is performed: - at a lower temperature compared to a temperature adapted to complete a curing cycle according to which the partially cured FRP parts (110, 120) are completely cured, and/or - during a shorter time compared to a time adapted to complete a curing cycle according to which the partially cured FRP parts (110, 120) are completely cured. - at a lower temperature compared to a temperature adapted to complete a curing cycle according to which the partially cured FRP parts (110, 120) are completely cured, and/or - during a shorter time compared to a time adapted to complete a curing cycle according to which the partially cured FRP parts (110, 120) are completely cured.