Makeup and/or care method of a nail and/or false nail, comprising the following steps: a) applying, onto a nail or false nail, a photocrosslinkable cosmetic composition C1, whereby a coat consisting of at least one layer of said composition C1 is deposited; the composition C1 comprising in a physiologically acceptable medium: - at least one photocrosslinkable compound comprising at least two (meth)acrylate functions and at least one carboxylic acid function, - at least one volatile solvent S in a proportion greater than or equal to 30% in relation to the total weight of the composition C1, and - at least one photoinitiator, b) exposing the coated nail or false nail obtained following step a) to UV or visible light radiation, whereby photocrosslinking is carried out to obtain a crosslinked layer C'1; c) applying, onto the nail or false nail coated with the crosslinked layer C'1, obtained following step b), a photocrosslinkable cosmetic composition C2, whereby a coat consisting of at least one layer of said composition C2 is deposited; the composition C2 comprising in a physiologically acceptable medium: - at least one photocrosslinkable urethane di(meth)acrylate compound at a content by weight greater than or equal to 65% in relation to the total dry extract weight of C2, and - at least one volatile solvent S'; d) exposing the coated nail or false nail obtained following step c) to UV or visible light radiation, whereby photocrosslinking is carried out to obtain a crosslinked layer C'2. a) applying, onto a nail or false nail, a photocrosslinkable cosmetic composition C1, whereby a coat consisting of at least one layer of said composition C1 is deposited; the composition C1 comprising in a physiologically acceptable medium: - at least one photocrosslinkable compound comprising at least two (meth)acrylate functions and at least one carboxylic acid function, - at least one volatile solvent S in a proportion greater than or equal to 30% in relation to the total weight of the composition C1, and - at least one photoinitiator, - at least one photocrosslinkable compound comprising at least two (meth)acrylate functions and at least one carboxylic acid function, - at least one volatile solvent S in a proportion greater than or equal to 30% in relation to the total weight of the composition C1, and - at least one photoinitiator, b) exposing the coated nail or false nail obtained following step a) to UV or visible light radiation, whereby photocrosslinking is carried out to obtain a crosslinked layer C'1; c) applying, onto the nail or false nail coated with the crosslinked layer C'1, obtained following step b), a photocrosslinkable cosmetic composition C2, whereby a coat consisting of at least one layer of said composition C2 is deposited; the composition C2 comprising in a physiologically acceptable medium: - at least one photocrosslinkable urethane di(meth)acrylate compound at a content by weight greater than or equal to 65% in relation to the total dry extract weight of C2, and - at least one volatile solvent S'; - at least one photocrosslinkable urethane di(meth)acrylate compound at a content by weight greater than or equal to 65% in relation to the total dry extract weight of C2, and - at least one volatile solvent S'; d) exposing the coated nail or false nail obtained following step c) to UV or visible light radiation, whereby photocrosslinking is carried out to obtain a crosslinked layer C'2.