Will this interfere with the trunk seal or bumper clearance?

No. The three-piece lip is designed to sit flush with the factory bumper footprint. When installed at the factory mounting points, there's no interference with the hood, bumper, or trunk operation. Verify your specific vehicle's bumper condition before installation — any impact damage to the factory mounting area should be addressed first.

Can I install this using the factory fasteners, or do I need new hardware?

Installation uses the existing factory mounting points on the bumper. You'll need to verify that your vehicle's mounting holes are clean and the fasteners are in good condition. For any missing or damaged fasteners, refer to your vehicle's service manual for OEM part numbers and specifications.

How do I prep FRP for painting once it arrives?

Sand the entire surface with appropriate automotive-grade sandpaper to rough up the primer coating, then wipe clean with a damp cloth and let dry completely. Once prepped, apply your chosen primer and finish per the paint manufacturer's instructions. FRP takes paint well when the surface is properly prepared.