A method for bonding substrates, comprising at least the steps of - applying a single-component polyurethane adhesive to at least one of the substrates to be bonded, the single-component polyurethane adhesive containing at least one propellant which is selected from dimethyl ether and dimethoxymethane and being dispensed out of a pressurized container as a foam, and - subsequently pressing together the substrates to be bonded, characterized in that - the proportion of dimethyl ether and dimethoxymethane, based on the total amount of propellant contained, is at least 90 % by weight, preferably 100 % by weight, and - the single-component polyurethane adhesive contains • 30 to 70 % by weight, preferably 30 to 60 % by weight, of at least one compound comprising two or more, optionally masked, isocyanate groups, • 20 to 60 % by weight, preferably 25 to 60 % by weight, particularly preferably 30 to 60 % by weight, of at least one compound comprising at least two hydroxy groups, • 0.01 to 2.5 % by weight, preferably 0.02 to 1.25 % by weight, of at least one curing catalyst, • 5 to 49.99 % by weight, preferably 7 to 40 % by weight, particularly preferably 8 to 30 % by weight, of at least one propellant, and • 0 to 10 % by weight, preferably 0.5 to 5 % by weight, of at least one foam stabilizer, in each case based on the total weight of the single-component polyurethane adhesive. - applying a single-component polyurethane adhesive to at least one of the substrates to be bonded, the single-component polyurethane adhesive containing at least one propellant which is selected from dimethyl ether and dimethoxymethane and being dispensed out of a pressurized container as a foam, and - subsequently pressing together the substrates to be bonded, - the proportion of dimethyl ether and dimethoxymethane, based on the total amount of propellant contained, is at least 90 % by weight, preferably 100 % by weight, and - the single-component polyurethane adhesive contains • 30 to 70 % by weight, preferably 30 to 60 % by weight, of at least one compound comprising two or more, optionally masked, isocyanate groups, • 20 to 60 % by weight, preferably 25 to 60 % by weight, particularly preferably 30 to 60 % by weight, of at least one compound comprising at least two hydroxy groups, • 0.01 to 2.5 % by weight, preferably 0.02 to 1.25 % by weight, of at least one curing catalyst, • 5 to 49.99 % by weight, preferably 7 to 40 % by weight, particularly preferably 8 to 30 % by weight, of at least one propellant, and • 0 to 10 % by weight, preferably 0.5 to 5 % by weight, of at least one foam stabilizer, • 30 to 70 % by weight, preferably 30 to 60 % by weight, of at least one compound comprising two or more, optionally masked, isocyanate groups, • 20 to 60 % by weight, preferably 25 to 60 % by weight, particularly preferably 30 to 60 % by weight, of at least one compound comprising at least two hydroxy groups, • 0.01 to 2.5 % by weight, preferably 0.02 to 1.25 % by weight, of at least one curing catalyst, • 5 to 49.99 % by weight, preferably 7 to 40 % by weight, particularly preferably 8 to 30 % by weight, of at least one propellant, and • 0 to 10 % by weight, preferably 0.5 to 5 % by weight, of at least one foam stabilizer,