Will the carbon fiber lip interfere with the factory trunk seal or bumper panel?

The Sequence profile is designed to integrate with the existing front end without interference. Verify fitment by comparing the lip profile to your bumper's lower edge before final installation. If you've modified your bumper or lower fascia, test fit the lip in place first.

Should I keep the clear coat finish or sand it for a custom paint match?

The clear coat provides UV protection and is ready to drive as-is. If you want to match your body color, sand the surface and apply your chosen primer and paint system. Sand gently to preserve the carbon fiber weave pattern underneath.

What's the best way to secure this to the front bumper?

Carbon fiber lips typically use adhesive or fastener mounting depending on your bumper design. Dry-fit the lip first to identify existing hole locations or mounting points on your bumper, then reference your vehicle's service manual or consult your bumper documentation for fastener specs and installation order.