POR15 High Temp Aluminium (aka POR-20) Heat Resistant Paint is guaranteed up to 650 deg C without peeling or flaking. Can even be used on turbochargers
POR-15 high temperature coating is extremely resistant to the weather including salt and moisture.
Two thin coats are recommended the first is air dried the second is cured at 150 deg C either in an oven or by the engine.
Can be brushed or sprayed. Use POR 15 Solvent to thin. Lacquer thinner may be used for cleanup.