Royal & Langnickel Essentials Acrylic Paint Pouring Medium. Specially formulated to achieve even, flowing color! Mix with acrylic paints to increase its flow, and achieve fun marbling effects on your canvas! No cracking, and maintains the vibrancy of your paint color! This formula is flexible, non-yellowing and water resistant once dry. Great for teens and adults, students, crafters, hobbyists and more!