Hello, Please can you tell me what paint I can use to paint inside a fireplace which will have a wood burning stove in it? The stove will only be about 20/30cm away from the surface to be painted but it is being installed professionally. We would like a dark grey colour but we're also interested in bright colours if they're available in suitable paints. The surface is heat resistant, and flame proof concrete plaster board. Many thanks Claire Wolsey