A method of coating a carbon component with silicon-silicon carbide. The method involves sequentially applying and drying onto at least a part of the carbon component a first composition comprising silicon carbide, carbon, a binder and a solvent, and a second composition comprising silicon, a binder and water. The coating compositions are then fired to provide the silicon-silicon carbide coating on the carbon component. The method may allow a more controlled and cost-effective silicon-silicon carbide coating, particularly for relatively complex carbon components such as degassing rotors. The binder may be styrene acrylate co-polymer. The solvent may be water. A carbon component comprising the silicon-silicon coating and coating compositions for use forming said coating are also provided. Disclosed are compositions for coating a substrate with silicon carbide and for silicizing silicon carbide.
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