Spray it with a light colour crackle over the top to replace the missing then use Silver King aerosol paint over the top. Its heat resistant and what the engine painters use.
...as Allan says
The link throws up an error.
Try this: http://www.gasup.it/gb/high-temperature/15-thermodur-650-high-temperature-paint-coating.htmlThe link throws up an error.
Thanks Zep