Will this diffuser scrape on steep driveways or parking lot inclines?

The UTech profile sits at the lower bumper edge with integrated ground clearance. Verify your vehicle's approach angle against local terrain before final installation. Most driveway angles will not cause contact, but speed over steep transitions should be controlled.

Does this provide functional downforce or is it purely cosmetic?

The diffuser channels air outward and downward through its geometry, which aids rear-end stability at highway speeds. This is a functional aerodynamic element, not a decorative piece — the design redirects underbody airflow to reduce lift rather than create it.

What prep work is needed before painting?

Sand the surface with appropriate grit to promote paint adhesion, then clean thoroughly to remove dust. Apply your chosen topcoat system per the paint manufacturer's specifications. UV exposure during storage before paint can dull the gelcoat, so keep it covered until you're ready to finish.