Will this interfere with my factory bumper or air dam?

The racer lip is designed to mount to the lower fascia. Confirm mounting points on your bumper are clear before assembly. If your factory air dam is still installed, check for contact with the lip extension — you may need to trim or remove the air dam depending on fitment.

What's the best way to prep FRP for paint?

Sand the surface lightly to ensure adhesion, then clean thoroughly to remove dust and debris. Apply your chosen primer and finish per the paint manufacturer's specs. FRP bonds well with urethane and acrylic systems when properly prepped.

Can I drill mounting holes myself, or does this come with pre-drilled points?

Align the lip to your factory mounting locations and mark before drilling. Use a drill bit appropriate for FRP to avoid cracking, and work slowly. Refer to your vehicle's service manual or OEM bumper documentation to confirm exact mounting hole locations and fastener specifications.