Will this lip interfere with the bumper cover when it's installed?

No. The racer lip is engineered to sit flush with the factory bumper cutline. Test-fit the lip against your bumper before final fastening to confirm alignment — minor gaps or overlap at the seams are normal and can be addressed with trim or shim adjustment.

What's the best way to prepare FRP before painting?

Sand the primer surface with progressively finer grit sandpaper to scuff the gelcoat, then wipe clean with a tack cloth to remove dust. Follow your paint manufacturer's recommendations for primer type and surface prep — epoxy and polyester primers both work well on FRP. A quality primer ensures your topcoat adheres evenly and won't peel.

Can I adhesive-bond this, or do I need to drill through the bumper?

Drilling through factory bumper mounting points is the recommended method for a permanent install. If you prefer adhesive-only mounting, ensure both the lip and bumper surfaces are fully degreased and roughed up for maximum contact. Adhesive alone carries more risk in high-vibration or highway driving, so fasteners provide the most stable long-term hold.