Dont use normal spray can laquer its not good enough to last on a rocker cover, even 2k lacquer can dry out and crack but thats the best to use, u can actually buy cans of 2k lacquer too which would be more durable. Obviously u can get high temp lacquers etc.

I did mine in candy blue with about 3 coats of high solids lacquer so hopefully will last, also painted my inlet in a course metallic silver which looks pretty good