A surface of a hot ribbon of glass, which has just been formed, is coated by directing a flow of coating gas substantially parallel to the glass surface under laminar flow conditions. The laminar flow is in the direction of ribbon advance or co-current to that direction, and the gas is released uniformly across the width of the ribbon. The coating gas contains a constituent, for example a silane, which decomposes on the hot glass surface to deposit a coating, for example silicon, on the glass surface.
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