Do I need to remove the bumper skin to install this?

Yes. The reinforcement bar sits behind the bumper cover, so you'll need to unbolt and separate the skin first. Once mounted, the skin bolts back over it normally.

Will this work with an aftermarket bumper?

This bar is engineered for the OEM bumper assembly. If you're running an aftermarket bumper with different mounting geometry, test-fit before final installation to confirm clearance and bolt alignment.

Does this come pre-primed or raw?

Finish condition is not specified in the product data. Before installing, inspect the bar and plan surface prep accordingly — whether that's primer, paint, or protective coating based on your bumper's current condition.