A method for forming a coating on a substrate, the step of performing triboelectric charging of the powder by a part forming a fluidized bed of the powder in the fluidized chamber is electrically conductive, the conductive portion of the flow chamber applying a voltage, is electrically or weakly conductive is non-conductive, electrically or are insulated, or a substrate is grounded, wholly or partially immersed in the fluidized bed method comprising the step, step withdrawing the said substrate from the fluidized bed, and the attached particles, the step of forming into a continuous coating over at least a portion of the substrate.