Will this interfere with the factory bumper seal?

The BR-Y profile is designed to clear the OEM bumper cover without compression. Before installation, verify your bumper is in stock condition — any damage or warping to the factory plastic will affect fitment. Dry-fit the lip first to confirm alignment with your specific bumper condition.

Does this require drilling, or does it bolt to the existing bumper holes?

This lip mounts to factory bumper mounting points. If your vehicle has factory reinforcement holes, use those. If holes are not present, you'll need to drill. Reference your OEM service manual or examine the bumper structure before purchasing to confirm your mounting strategy.

How should I prep the FRP before paint?

Sand the entire panel with a medium-grit abrasive to scuff the primer coat and improve adhesion for your topcoat. Wipe with a tack cloth to remove dust. Apply your chosen primer and paint system per the product manufacturer's instructions — FRP takes standard automotive primers and paints without special treatment.