NOVELTY - Fixing two-component polyurethane composition comprises a polyol component and a polyisocyanate component, where the polyol component includes at least castor oil, at least one polyol with 5-8 hydroxyl groups, at least one polyether- and/or polyester polyol based on castor oil or soybean oil with a hydroxyl number (150-200 mg potassium hydroxide/g and at least one polyether- and/or polyester polyol based on castor oil or soybean oil with an hydroxyl number (210-300 mg potassium hydroxide/g and, where the polyisocyanate component includes at least one polyisocyanate.    USE - The composition is useful as an adhesive, preferably as a structural adhesive, as a non-positive medium for backfilling joints or gaps, and as the force-bearing structural element in the construction of rotor blades for wind turbines (all claimed).    ADVANTAGE - The composition: exhibits extended open time for sealing after application to a substrate and after prolonged exposure to a climate with high humidity; and exhibits good balance between elongation and tensile strength in terms of a viscoelastic materials.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for    (1) method for a non-positive filling of joints and gaps in a substrate comprising (a) mixing the polyol component and the polyisocyanate component of a two-component polyurethane composition, (b) applying the mixed composition into the polyurethane to be bridged joint between two substrates or in the gap to be filled on the surface of a substrate, and (c) curing the polyurethane composition in the joint or in the gap;    (2) method for bonding comprising (i) mixing the polyol component and the polyisocyanate component of a two-component polyurethane composition, (ii) applying the mixed polyurethane composition to at least one of the substrate surface to be bonded, (iii) joining within the open time, and (iv) curing the polyurethane composition; and    (3) obtaining articles from the above mentioned method.