Do these fenders require drilling or modification to the existing body?

No. These fenders are engineered to use factory mounting points, so installation uses existing fastener holes without cutting or drilling into the chassis or body panels.

Will tire clearance be affected with these flares installed?

The GPR flare profile adds extension to the rocker area. Verify your tire and suspension setup clears the new panel geometry before final fitment. Check the flare position during full compression and at full lock to confirm adequate clearance.

What surface prep is needed before painting?

Sand the surface with appropriate grit to promote paint adhesion, then clean away dust and contaminants. Follow your paint manufacturer's instructions for undercoat and topcoat application over the prepped FRP base.