The best sketchbooks for watercolor and wet techniques. No matter what kind of watercolors you use, it is the paper that determines whether your works will look good or not. Koval Sketchbooks produces the best sketchbooks for watercolor. We use cotton papers from the best manufacturers: Fabriano, Saunders or Arches. These are well-known papers produced by traditional mould made technique. Only such allow you to bring out the true depth of watercolor. These are sketchbooks in various sizes and with different weights and surfaces of paper.