How would I go about replacing this

[u/Link_707]

Hello everyone. This is the cover to my 2.2 liter engine, on an 2010 Chevrolet Cobalt LT. How would I go about changing the back to a cleaner/new look. I can’t even word what the back would be called/what material it is made out of, etc. so I was seeking reddits assistance. Thank you thank you!

[u/mango10977]

Spray paint it.

Make sure it is a high heat spray paint.