this results in the hydrophobic coating remaining also on said opposite surface of the stamp body the surface of the stamp body opposite of the stamping surface 110 is brought into contact with a protective layer 70 u2032 which may e g be made of pdms subsequently an adhesion promoter coating 50 is provided on the surfaces of the stamp body which are not covered by the hydrophobic coating 60 or the protective layer 70 u2032 i e the inner surfaces of the reservoir 20 and the channels 30 and the outer side walls of the stamp body 10 the stamp body 10 is now provided with the hydrophobic coating 60 on its stamping surface and the adhesion promoter coating 50 on the inner surfaces of the reservoirs 20 and the channels 30 and the outer side walls of the stamp body 10 as shown in fig3 d the coated stamp body is then immersed in a solution of reactive monomers of e g hema and egdma and other components necessary for the reaction as shown in fig3 e the reactive monomers are reacted and crosslinked resulting in a hydrogel 40 filling the reservoirs 20 and the channels 30 and attached to the adhesion promoter coating 50 provided on the inner walls of the reservoirs 20 and the channels 30 as shown in fig3 f the hydrogel 40 slightly protrudes from the channels the hydrogel is formed also on the outer side walls of the stamp body 10 but it is removed the stamp 100 according.