For demanding underwater applications, DuraCopy waterproof copier paper is unrivaled in endurance, performance, and ease of use. Synthetic yupo paper is completely waterproof and holds strong underwater. Simply print your document onto DuraCopy paper from a laser printer, and your document will be ready to brave the depths. Your dive logs, maps, and other documents will be safe, even in periods of prolonged submersion. When dry, DuraCopy paper can be marked with pencil, ballpoint pen, permanent marker, and other popular writing utensils. Even deep underwater, our DuraCopy products will keep your notes and documents intact.