Do I need to prime or sand this before painting?

No. This bumper arrives in raw FRP condition and can go straight to the paint booth. If you prefer a guide coat or final scuff, that's up to you, but no stripping or bare FRP prep is required.

Will the factory sensor holes or fog light openings line up?

This cover is designed for direct replacement using the original mounting points. Sensor cutouts and any factory holes align with stock fitment — no drilling or enlargement needed on your end.

Is this a one-piece or multi-piece bumper?

Single piece. You get one complete rear bumper cover assembly, which simplifies installation and eliminates seams in the center of the panel.