I use these Sharpie White Poster paint markers every day! It’s like having a little pot of opaque white, fluid acrylic ink. .
Shake them up with the lid on, and off you go! They write and draw over just about anything!
From the Sharpie Site:
“Get your Rembrandt on.
- Great for scrapbooking, art projects, posters and signs
- Water and fade resistant ink will not bleed through heavyweight paper
- Water-based opaque marker
- Acid free
- Archival quality
- Safe for use by children
- AP Certified