Will this interfere with the trunk seal or tailgate gap?

No. This rear lip is designed to sit below the factory bumper line and clear the trunk sealing edge. Verify fitment on your vehicle before final fastening to account for any suspension modifications that may alter ride height.

Do I need to drill new holes or can I use factory mounting points?

Use the factory underbody attachment points — no drilling required. This keeps the install reversible and avoids structural modification. Reference your vehicle's undercarriage before ordering to confirm mounting hole alignment.

How should I prep the FRP before painting?

Sand the entire surface with appropriate grit to achieve adhesion, then clean off all dust. Apply primer suitable for plastics, then your chosen topcoat. FRP takes standard automotive finishes well once properly prepped.