Will this work with my factory stereo?

The aux jack connects to the back of your factory head unit if it has an auxiliary input. If your stereo doesn't have one, you'd need an aftermarket unit or an FM modulator setup. Check your owner's manual to confirm your radio supports aux input.

Do I need any brackets or hardware to install this?

Uses factory mounting points, so no additional brackets or drilling. Fastening method isn't specified in the product data — test-fit before committing to clips, adhesive, or fasteners.

Does the panel need paint or prep before installation?

Comes ready to install as-is. If you want a custom finish, light scuff with fine grit and test in an inconspicuous area first to confirm the material accepts paint or dye properly.