Will this interfere with my front bumper or undertray?

The MDF style lip is designed to sit flush beneath the factory bumper line. Before installation, verify clearance between the spoiler tip and any existing undertray or bumper reinforcement. If your vehicle has been lowered significantly, test fit to confirm the lip does not contact the road on ramps or steep driveways.

Does this need a clear coat, and what should I use?

Carbon fiber benefits from UV-protective clear coat to preserve the weave and prevent oxidation. Sand the surface lightly and apply your preferred automotive clear—polyurethane or epoxy both work well. This step is highly recommended if the lip will see direct sunlight regularly.

How do I mount this to my bumper?

Mounting method depends on your bumper design and drilling tolerance. The lip can be fastened through existing bumper holes or bonded with automotive-grade adhesive. Reference your vehicle's bumper layout to determine which method suits your setup, and use appropriate fasteners rated for carbon fiber.