Will this interfere with the trunk seal or undercarriage at speed?

No. The profile is designed to sit flush with OEM bodylines and factory mounting points. Verify clearance with your bumper and splitter setup before final install — some aggressive splitter combinations may require fitment verification on your specific build.

Should I adhesive-bond or drill through the factory holes?

This lip uses factory mounting points and fasteners. Drilling is not required — align the holes and secure with appropriate fasteners for your application. A small amount of sealant around the perimeter is optional but recommended to prevent water intrusion at the panel edges.

What prep work does FRP need before paint?

Sand and prep the surface thoroughly before applying your chosen primer and finish. FRP surfaces benefit from light sanding and a clean wipe-down to ensure good paint adhesion. Refer to your paint supplier's prep guidelines for the specific primer and topcoat you select.