A composition for preparing a (poly)urethane, the average functionality of which is greater than 2, comprising (a) an isocyanate component with an NCO functionality comprised between 1.9 and 2.7 and comprising at least one allophanate • with an NCO functionality equal to 2 +/- 5% and • of formula wherein o R 1 represents the residue of a mono-alcohol compound comprising an ether or polyether function after reaction of the hydrogen of the OH function with a compound with an isocyanate function; o R 2 and R 3, either identical or different, represent a hydrocarbon group, comprising a derived or non-derived isocyanate function; (b) at least one hydrophobic resin with hydroxyl functions • with a molar mass of more than 500 g/mol; • with an OH functionality equal to 2 or greater than 2; • solubility parameters with a value of less than 20.4 MPa 1/2 and • different from a polyamine selected from acrylonitrile/butadiene copolymers with amine end functions, selected from o a linear or branched poly-propylene with hydroxyl groups; o a linear or branched poly- propylene with hydroxyl end groups; o a linear or branched hydroxylated poly-butadiene with hydroxyl groups; o a linear or branched hydroxylated poly-butadiene with hydroxyl end groups; o a linear or branched hydroxylated poly-butadiene. (a) an isocyanate component with an NCO functionality comprised between 1.9 and 2.7 and comprising at least one allophanate • with an NCO functionality equal to 2 +/- 5% and • of formula wherein o R 1 represents the residue of a mono-alcohol compound comprising an ether or polyether function after reaction of the hydrogen of the OH function with a compound with an isocyanate function; o R 2 and R 3, either identical or different, represent a hydrocarbon group, comprising a derived or non-derived isocyanate function; • with an NCO functionality equal to 2 +/- 5% and • of formula wherein o R 1 represents the residue of a mono-alcohol compound comprising an ether or polyether function after reaction of the hydrogen of the OH function with a compound with an isocyanate function; o R 2 and R 3, either identical or different, represent a hydrocarbon group, comprising a derived or non-derived isocyanate function; o R 1 represents the residue of a mono-alcohol compound comprising an ether or polyether function after reaction of the hydrogen of the OH function with a compound with an isocyanate function; o R 2 and R 3, either identical or different, represent a hydrocarbon group, comprising a derived or non-derived isocyanate function; (b) at least one hydrophobic resin with hydroxyl functions • with a molar mass of more than 500 g/mol; • with an OH functionality equal to 2 or greater than 2; • solubility parameters with a value of less than 20.4 MPa 1/2 and • different from a polyamine selected from acrylonitrile/butadiene copolymers with amine end functions, selected from o a linear or branched poly-propylene with hydroxyl groups; o a linear or branched poly- propylene with hydroxyl end groups; o a linear or branched hydroxylated poly-butadiene with hydroxyl groups; o a linear or branched hydroxylated poly-butadiene with hydroxyl end groups; o a linear or branched hydroxylated poly-butadiene. • with a molar mass of more than 500 g/mol; • with an OH functionality equal to 2 or greater than 2; • solubility parameters with a value of less than 20.4 MPa 1/2 and • different from a polyamine selected from acrylonitrile/butadiene copolymers with amine end functions, selected from o a linear or branched poly-propylene with hydroxyl groups; o a linear or branched poly- propylene with hydroxyl end groups; o a linear or branched hydroxylated poly-butadiene with hydroxyl groups; o a linear or branched hydroxylated poly-butadiene with hydroxyl end groups; o a linear or branched hydroxylated poly-butadiene. o a linear or branched poly-propylene with hydroxyl groups; o a linear or branched poly- propylene with hydroxyl end groups; o a linear or branched hydroxylated poly-butadiene with hydroxyl groups; o a linear or branched hydroxylated poly-butadiene with hydroxyl end groups; o a linear or branched hydroxylated poly-butadiene.