Do these require drilling or modification to the existing body?

No. Over fenders bolt directly to existing mounting points without cutting or permanent modification. Verify your vehicle's OEM fastener locations and hardware before assembly to confirm compatibility with your setup.

What prep work is needed before painting?

Sand the surface with appropriate grit to achieve good paint adhesion, then clean thoroughly to remove dust. Apply your chosen primer and topcoat according to the paint manufacturer's specifications for FRP substrates.

Will these panels fit correctly out of the box?

The two-piece design allows you to adjust each panel independently for gap alignment during installation. Minor fitment tweaks may be needed depending on your vehicle's condition — this is normal and expected with over-fender applications. Use shims or adjust mounting points to dial in the perfect gap.