Method for coating surfaces with finely particulate materials

A method of coating a surface of a nonconductor substrate with particulate solid particles by substrate-induced coagulation, comprising steps of:

• (a) treating the nonconductor substrate with a first solution containing a first polar solvent and at least one coagulation initiator comprising a soluble polymer so that the coagulation initiator adheres to the substrate;
• and,
• (b) subsequently coagulating the particulate solid particles on the non-conductor substrate by contacting the substrate treated in step (a) with a dispersion containing a second polar solvent and:
• i) the particulate solid particles,
• ii) at least one surfactant for preventing sedimentation of the solid particles prior to the coagulation, and
• iii) a salt for promoting destabilization of the dispersion during the coagulation, and wherein the first and second polar solvent are the same or different.