Should I cover the bold white brand name lettering on a black camera body using permanent marker or enamel paint for plastic toys.?
Permanent marker is fine
You shouldn't. If it's new, you void warranty. If it's old, you lose bragging rights.
Why? Are you in a documentary where brand names need to be obscured or the logo makes it easier to spot you? Are you embarrassed? Anything you do will show and will look funny. Perhaps you need to paint the camera body some weird color like Kai does on DigitalRev.
SSP Bowl Dude
Use a piece of black gaffer's tape. You may want the name intact if you sell it.