Will this interfere with my front bumper or existing undertray?

The MDF profile is designed to sit below the factory bumper line. Before installation, verify clearance with your existing undertray or splitter. If you're running a custom front end, mock-fit the lip to confirm it doesn't contact brake ducts or sensor mounts.

Should I use adhesive or drill through the mounting points?

Drill-through fastening offers the most stability at speed and resists vibration better over time. If you prefer adhesive-only mounting, use a high-strength polyurethane automotive adhesive and allow full cure time before driving. Hybrid approach—adhesive plus stainless fasteners through factory holes—provides maximum durability.

What prep work does the surface need before painting?

Sand the entire surface with medium-grit sandpaper and wipe clean with a damp cloth to remove dust. Apply a quality automotive primer if your paint system requires it, or proceed directly to basecoat if using a primer-in-one product. Check your paint manufacturer's instructions for compatibility with FRP substrates.