Assuming the boarding is bare, clean, dry, sound and prepared as detailed in the technical data sheet you could consider Tikkurila Muuri.

This can withstand upto 300°C with the white colour, or upto 180°C with the tinted colours.

We would recommend to check what temperatures the boards are likely to be exposed to.

The are also other fireplace paints available, if you would like to ask us about other options.