I didn’t think much about watercolor paper when I first started painting. I just grabbed what I could find, focused on color mixing, and worked from life or photo references using loose observational sketches.
But the more I painted, the more I realized that watercolor paper isn’t just a surface – it completely shapes how a piece turns out.
Learning how watercolor paper is made changed how I choose materials, how I sketch, and even how I layer light and shadow in a drawing.
If you're like me and you build a painting from the ground up, starting with large shapes of light and form before layering expressive details, your paper needs to cooperate, not fight back. It needs to handle wet washes, dry textures, and everything in between without buckling or turning to mush.
That’s where understanding how watercolor paper is made becomes surprisingly important.
Key Points
- Watercolor paper can be made by hand, mold, or machine – and the method changes how it absorbs paint and handles repeated layers
- Cotton (100%) gives you the best durability and blendability, especially for wet-on-wet and layered styles
- The sizing (usually gelatin) controls absorbency, so choosing the right kind keeps your washes vibrant instead of dull
How Watercolor Paper Is Made: A Behind-the-Scenes Look
Most people don’t think about how their watercolor paper was created, but it has a bigger impact than any brush you pick up. The method of manufacturing directly affects texture, strength, and how watercolor behaves on the surface.
Handmade, Mold Made, or Machine Made
There are three main methods used to create watercolor paper:
Handmade Paper
This is the most traditional and time-consuming method. Cotton fibers are suspended in water and poured onto a screen by hand. Each sheet is individually formed, pressed, and dried.
This gives it a natural, deckled edge and an irregular, organic surface. It's often more absorbent and durable, making it a favorite for artists who want a tactile, expressive painting experience.
But handmade paper is expensive, and not always easy to find in standard formats or sketchbooks.
Mold Made Paper
Mold made is the sweet spot between handmade and machine made. It mimics the handmade process with a rotating cylindrical mold that lifts fibers from a pulp vat and forms consistent sheets.
The result? A sturdy, slightly textured surface with naturally random fiber orientation. That means the paint absorbs evenly, and the paper doesn’t warp too much when wet.
Papers like Arches, Saunders Waterford, and Fabriano Artistico are mold made and worth the investment.
Machine Made Paper
This is made on a flat conveyor-like system where fibers align mostly in one direction. That directionality means some areas might soak up water differently than others, especially under heavy washes.
It’s cheaper and great for early practice or bulk sketching, but it tends to buckle, pill, or lose vibrancy faster under repeated layers. Most student-grade watercolor pads fall into this category.
Why Materials and Sizing Matter
When I switched to 100% cotton paper with gelatin sizing, everything changed. My washes stopped drying patchy, my details stayed crisp, and I didn’t have to fight the paper every time I wanted to rework a shape.
If you’ve ever tried to paint a clean gradient and had the color suddenly soak in too fast or lift unevenly, sizing is likely the issue.
Cotton vs. Wood Pulp
- Cotton (rag): Strong, flexible, and absorbent. It can handle re-wetting and heavy layering without breaking down. Great for techniques like glazing and wet-on-wet.
- Wood pulp: Less expensive but far less durable. It often pills when scrubbed or overworked, and it doesn’t hold color as vibrantly. Okay for beginners, but frustrating if you're layering or lifting.
A lot of early watercolor struggles come down to poor paper. I used to think I was doing something wrong when my colors got muddy or the paper tore. Turns out, I just needed to switch to a better base.
This is especially true when I’m working with materials like watercolor pastels or doing ink and wash work, where surface stability is everything.
Sizing Controls Absorbency
Watercolor paper is treated with sizing (usually gelatin or synthetic) to keep the paint from soaking in too fast. Without sizing, your brushstrokes would blur and dull immediately.
- Externally sized: Sizing is applied after the paper is formed. This gives a softer feel and is often found in watercolor sketchbooks.
- Internally sized: Sizing is added to the pulp before sheet formation, making the entire sheet more evenly treated and more durable.
Some papers are both internally and externally sized. That combination gives you the best control, especially if you're layering subtle tones like when you're mixing gray in watercolor or building delicate skin tones.
Texture: Cold Press, Hot Press, or Rough?
The texture of the paper impacts how it holds pigment, how smooth your lines are, and how light reflects off the surface.
I go into more depth in my article on types of watercolor paper, but here’s the quick rundown:
- Cold press: My go-to. It has enough tooth to grip pigment but is still smooth enough for detail. Works well for observational drawing, especially with expressive brushwork.
- Hot press: Slick and smooth, great for crisp line work, flat washes, or ink overlay.
- Rough: Heavy texture that emphasizes granulation and creates unexpected, beautiful chaos.
If you're working in a hot press watercolor sketchbook for smoother illustration or blending subtle washes, texture becomes a conscious decision.
Personal Insights: What I Actually Use
I keep a few different sketchbooks and loose sheets around depending on what I’m doing:
- For sketching outdoors, I love my travel watercolor book and often work in a sturdy watercolor sketchbook that can handle quick, expressive layering
- For studio work, I stretch large sheets of cotton paper using the best tape for watercolor paper to minimize warping
- After painting, I use a simple method to flatten a watercolor painting so I can scan or store it neatly
- Finished pieces go into flat files and folders, with more tips in my watercolor storage post
Even when I’m using more experimental media like water soluble wax pastels or testing out fun watercolor techniques, I never skimp on paper.
Why It Matters for Observational Artists
Because I draw from real life or photos, the paper has to let me build a drawing gradually. I start with big blocks of light and form, sketching loosely with a brush or pencil, and then refine shapes from the inside out.
This means I need a surface that holds up to changes. I often lift or adjust sections, so if the paper tears or stains too quickly, it kills the drawing.
Observational sketching thrives on layering. The ability to lift, rework, or fade out shapes without destroying the surface is what allows the drawing to evolve naturally.
Also, when I'm mixing subtle values like in skin tones or working on controlled transitions for something like color mixing, the paper has to stay responsive.
These days, I make sure every supply I use complements the kind of art I want to make. If you're just getting started, here's which watercolor is best for beginners and what watercolor brushes to start with.
If You Want to Dive Deeper
Here are a few posts that build on this:
- Curious about how to mix better color? Check out this color mixing chart for watercolor.
- Not sure where to begin with materials? Here’s what watercolor brushes to start with and which watercolors are best for beginners.
- Wondering about non-paper surfaces? I answered that in can watercolor be used on canvas.
- Looking for your first sketchbook? This guide to the best watercolor journals will help.
Watercolor is one of those mediums that rewards you for slowing down and understanding your tools. It’s not about being perfect. It’s about building confidence, one shape at a time.
I studied character animation at CalArts, where we spent just as much time observing form and gesture as we did learning craft. That mindset stuck with me, and it’s shaped how I use watercolor every day.
If you want more tips and gear recommendations for getting started or improving your painting process, my watercolor tutorials has all my best resources in one place.