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As Shiftin Gear says Rattle cans are single pack paint and are not that robust.Most commercial paints are ,"Two-Pack" which is Paint and hardener.We use,"Triple Pack" paints now on Aircraft.

However High Temp engine Matt Black is more robust than most Rattle can paint so you can give that a go and it's also easy to maintain/Respray when it looks shoddy.

Word of warning though.If you ever going to spray a different paint onto another you should make a small test piece and spray that with the original paint and let cure and then paint on top of that with the new paint to see if there's a reaction as not all paints are compatible with each other.

Paint spraying in all forms is a process and has more variables than people think and cannot be rushed.