Will this interfere with the trunk seal or bumper panel at highway speeds?

No. The racer-style lip is designed to clear the factory bumper assembly and seal components. Verify fitment by checking the lip's alignment with your vehicle's bumper edges before final fastening.

Should I use adhesive or drill through the bumper to mount this?

This lip uses factory bolt locations, so no drilling or adhesive is needed. Fasteners secure directly through existing OEM attachment points. Refer to your vehicle's service manual for the correct fastener size and torque specifications.

How do I prep the FRP before painting?

Sand the surface with fine grit to smooth any mold lines, then wipe clean. The FRP accepts standard automotive primers and paints — apply per your paint product's instructions. Test your chosen primer on a small area first to ensure adhesion.