Do these over fenders require modification to my existing fenders?

No. The over-fender design sits on top of your current panels, so there's no cutting, grinding, or welding involved. You'll need to verify mounting hole locations and potentially drill new fastener points depending on your specific setup.

What prep work should I do before painting?

Sand the surface thoroughly to establish proper paint adhesion, then clean away all dust before applying your base coat and clearcoat. The primer surface is your foundation for a clean, durable finish.

Will these over fenders affect my wheel fitment or tire clearance?

Over fenders add volume to the wheel well opening, so verify your wheel size and offset against the new panel profile. Measure wheel-to-panel gap before final installation to confirm your setup clears without rubbing.