A method of coating a structured metal foil matrix in a mantle. The mantle has first and second overhangs at opposing ends into which the matrix does not extend. The matrix has a plurality of channels which are coated with wash-coat slurries having a catalyst by: (i) holding the substrate substantially vertically with a first end of the substrate being the upper end and introducing a first pre-determined volume of a first wash-coat slurry onto the substrate via open ends of the channels at an upper end of the matrix; (U) removing blockage from cells and wash-coat from a portion of the mantle, (iii) moving, flipping or inverting the mantle into a vertical position where the second end of the matrix is the upper end and introducing a second pre-determined volume of a wash-coat slurry onto the matrix via open ends of the channels at the upper end of the matrix, and (iv) repeating step (ii). Excess slurry is removed by air-knife. An apparatus for performing this method is also described. The matrix may for use as a catalyst in treatment of vehicle exhausts.
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