Does this carbon fiber need clear coat protection?

Yes — apply a quality UV-protective clear coat after installation to preserve the weave finish and prevent yellowing from sun exposure. Without protection, real carbon fiber will dull and fade over time.

How do I seal the edges where the carbon meets the bumper?

Sand the mating edges lightly, then apply epoxy or a flexible adhesive sealant rated for carbon fiber before securing to the front bumper. This prevents moisture intrusion at the seams and maintains a clean appearance.

Does this bolt directly to the LBW bumper or does it need adhesive?

Mounting method not confirmed — test-fit the splitter to your bumper first to determine if fasteners, adhesive, or both are needed based on your alignment and preferred finish.