Do I need to drill new holes to install these over fenders?

No. These are engineered to use the existing factory mounting points on your vehicle. Before installation, verify hole alignment and condition on your specific car, as age and prior modifications can vary.

What prep is required before I paint these?

Sand the primer surface with appropriate automotive-grade sandpaper and wipe clean with a tack cloth. Apply your chosen primer, surfacer, and base coat according to your paint manufacturer's instructions. FRP accepts automotive finishes well when properly prepared.

Are these FRP panels rigid enough to handle minor impact without cracking?

FRP is durable for street use and handles typical road vibration well. However, it is not designed for high-impact collision protection — treat them as cosmetic body panels. Avoid contact with curbs and obstacles just as you would with OEM fenders.