Staedtler Lumocolor® Correctable Pens are a must have for your writing kit.
Write on white boards, polycarbonate, laminates, overhead projectors, you name it! These pens use water-soluble ink so you can dry wipe it clean with a cloth or it's built-in eraser.
They won't bleed through paper. Or explode in your luggage on a plane due to their automatic pressure equalization technology.