The document discusses different types of watercolor paper - hot pressed, cold pressed, and rough - and their characteristics and suitability for different techniques. Hot pressed paper has a very smooth surface that causes paint to puddle before being absorbed slowly. It takes detail well but is difficult for techniques like dry brushing. Cold pressed paper has a subtle texture and is very popular as it takes most techniques well and allows many layers without dulling underlying colors. The document also provides instructions for stretching lightweight watercolor papers to prevent buckling when water is applied.