Watercolor paper is the unsung hero of the medium. You can have the finest pigments and the most skilled brushwork in the world, but if you’re painting on the wrong paper, the results will be disappointing. Paper determines how water behaves on the surface, how pigment is absorbed, what textures appear in the finished painting, and how long the work lasts.
Here’s what you need to know about the main types and how they affect the art.
Hot Press vs. Cold Press vs. Rough
These three terms describe the surface texture of the paper, and they represent the most fundamental choice a watercolorist makes about their materials.
Cold press (also called “Not” paper in the UK, meaning “not hot-pressed”) has a medium texture — a slight, irregular tooth that’s visible up close. This is by far the most popular surface for watercolor painting, and it’s what I use for the majority of my work. The texture gives watercolor paint something to grip, creating the soft, granular effects that are characteristic of the medium. Wet washes settle into the paper’s valleys while the peaks remain lighter, producing a subtle, organic texture that adds visual interest to every brushstroke. Cold press is versatile — it works well for both loose, atmospheric painting and moderately detailed work.
Hot press has a very smooth surface with almost no visible texture. The paper is processed through heated rollers that flatten the fibers, creating a surface that’s ideal for fine detail, crisp edges, and smooth, even washes. Hot press paper is preferred by botanical illustrators, architectural painters, and anyone working with precision. The trade-off is that washes can be harder to control — the smooth surface means water and pigment move more freely and unpredictably. I use hot press for gouache work and when I’m combining watercolor with pen-and-ink, where I want the ink lines to be crisp and uninterrupted by paper texture.
Rough paper has a pronounced, heavy texture — deep valleys and prominent peaks that create dramatic granulation effects. Rough paper is beautiful for expressive, large-scale work where you want the texture of the paper to be a visible element of the painting. It’s less common than cold press but has passionate advocates among landscape painters and abstract watercolorists.
Paper Weight
Weight refers to the thickness and stiffness of the paper. In the US, it’s measured in pounds (lbs); internationally, in grams per square meter (gsm).
90lb (190gsm) is lightweight and economical — fine for practice and sketching, but it buckles badly when wet unless stretched beforehand. Not ideal for finished work.
140lb (300gsm) is the standard professional weight. It’s thick enough to handle generous water application with moderate buckling, and it can be stretched to lie perfectly flat. This is what most professional watercolorists use for the majority of their work, and it’s what I recommend for anyone serious about the medium.
300lb (640gsm) is heavyweight — thick, stiff, and stable. It doesn’t need stretching because it’s heavy enough to resist buckling even under aggressive water application. The trade-off is cost — 300lb paper is significantly more expensive. I use it for larger paintings and for commissions where I want the paper to be absolutely flat throughout the painting process.
Material: Cotton vs. Cellulose
The fiber composition of the paper matters enormously for both painting quality and archival longevity.
100% cotton (rag) paper is the professional standard. Cotton fibers absorb water evenly, hold pigment beautifully, allow for excellent wet-on-wet effects, and resist deterioration over time. Cotton paper is inherently acid-free and will not yellow or become brittle with age. Arches, Fabriano Artistico, and Saunders Waterford are the leading cotton watercolor papers.
Cellulose (wood pulp) paper is less expensive but performs noticeably worse. Water absorption is less even, colors appear less vibrant, wet-on-wet effects are harder to control, and the paper tends to pill or deteriorate when reworked. Cellulose paper that isn’t acid-free will yellow and become brittle over decades.
For any work intended to be sold, exhibited, or kept for more than a few years, cotton paper is essential. The difference in cost between a sheet of cotton and a sheet of cellulose is small relative to the value of the finished painting.
What I Use
My standard setup is Arches 140lb Cold Press for most paintings and Arches 300lb Cold Press for larger or more ambitious pieces. For gouache and ink work, I use Arches 140lb Hot Press. Occasionally I’ll reach for Fabriano Artistico or Saunders Waterford for variety — each brand has a slightly different character that can inspire different approaches.
