I have been thinking of turning the portion in red and blue to be black.

Do you guys recommend to just use vinyls to cover it or paint it matte black?
Can anyone recommend me a shop that does the painting well in perth?
For vinyls, is there anyone selling them or can recommend me to someone?
I have just ordered the VRX lip spoiler, so wasnt thinking of getting another lip spoiler for it.
Thanks!