Originally Posted by 5hort5

On the back of the Halfords High Temp stuff (in gloss black) it says

Apply with clean brush etc etc, the paint should be touch dry in 80 to 90 mins, second and subsequent coats must be applied within 2 hours. The coat will be fully cured and maybe re coated after 16 hours.

For best results use in warm dry and dust free environment

I picked up a tin yesterday for the same job and a few other spots on the engine, e.g. the crank bolt cover thing on the LHS