Do these bolt directly to factory mounting points, or do I need to drill?

They mount at existing factory rocker points — no drilling required. Bolting takes about an hour per side with basic hand tools.

Does the black powder coat need a topcoat or sealant before installation?

The powder coat is durable as-applied. You can bolt them on immediately. If you want extra protection in coastal or salt-heavy environments, a clear UV coat won't hurt, but it's not necessary.

What fasteners do I need to install these?

Mounting hardware is not included in this kit. Check your vehicle's service manual for the correct bolt size and torque specs for your factory rocker attachment points.