Use Bistro Chalk Markers, by Marvy Uchida, on chalkboards, light boards, windows, and windshields. They are opaque, water based, pigmented, and erasable when dry. 6mm tip.

Make an eye-catching display with these flourescent colours and watch them glow under an ultra violet light! Also great for outdoor applications such as car windshields. They'll stay on until you decide to wipe them off with a damp cloth.