From left to right: Cotman watercolour brush round (short handle), Jackson's Icon sable synthetic mix watercolour brush - flat 3/8in, Pro Arte Renaissance mop watercolour brush, Winsor & Newton Cotman watercolour brush series 333 - rigger, Princeton atrist brush Neptune dagger synthetic squirrel, size 38

Choosing the right brush is essential for bringing your artistic vision to life in watercolour painting. Dsiscover all you need to know about watercolour brushes - their shapes, the bounce and how to choose.

Brushes are more than just tools - an artists brush is an extension of their hand. But sometimes the myriad of different options can leave you confused. For example, what’s the difference between a round and a mop brush? Do you need synthetic or natural hair and how many brushes do you actually need?

You don’t need endless amounts of brushes to enable you to create beautiful art. In fact, understanding just a few essentials will help you paint with more confidence and control.

The perfect watercolour brush gives you both control and flow. Choosing the right shape and material makes all the difference.

Watercolour brushes are designed to:

• Hold water and pigment without dripping
• Maintain a sharp point or crisp edge
• Release paint smoothly and evenly

As you grow, you can add specialty shapes based on your painting style. Great brushes are tools of expression, not just tools of application. The more you get to know them, the more they become an extension of your hand. With a few well-chosen brushes and a sense of curiosity, you’ll be ready to explore all the beautiful marks you can make.

The higher the number, the larger the brush you get. A ‘0’ size brushes is perfect for fine detail, while you would use size 6+ to apply more paint.

Essential watercolour brush shapes

Here are the most useful brush shapes every beginner should know:

Round brush

The all-rounder! Tapered to a point and used for fine lines, details, washes and everything in between. This is the one watercolour brush you need to have. Recommended size: #6 or #8 for flexibility.

Flat brush

Square tip with flat bristles, this brush is great for crisp edges, bold washes, geometirc shapes and clean lines. Use for creating skies, backgrounds and wetting your paper evenly. Try a 1/2" or 1" flat brush for starters.

Mop brush

The mop brush is designed to hold plenty of water and is often made with squirrel hair. Used for creating broad, loose washes and soft blends it lends itself to wet-in-wet techniques or background layers.

Detail brush (Liner/Rigger)

The long thin bristles create fine lines, whiskers, branches and calligraphy. This brush gives the artist maximum control for detail work.

Dagger or Sword brush

The dagger, or sword brush, is angled with a fine point. This brush is particularly good for painting leaves and petals with varied stroke widths. The shape makes it great for painting both thick and thin lines in one stroke.

What is bounce?

With watercolour brushes, the bounce of a brush refers to the spring (also sometimes known as snap) or resilience of the brush bristles. When applying pressure to the brush, the bounce describes how the bristles respond. The bounce affects the artist's control and the type of marks the brush can produce.

A firmer bounce helps manipulate thick paint to create textured effects, while a softer bounce aids in smoother applications. The bounce determines how much feedback the artist feels through the brush, impacting precision. Artists often choose brushes with different bounces depending on the stage of the painting, from underpainting to fine detailing.

Selecting the right brush bounce is a personal preference and depends on the artist's style. You should also consider the type of watercolour paint and the desired outcome of the painting. If an artist prefers vigorous, gestural strokes, a brush with more bounce will help maintain control. Softer bounces are better for glazing or smooth blending, where less resistance is needed.

Bristle material

As a general rule, natural hair brushes are more expensive than synthetic brushes. They are usually softer, and the hair will wear down more softly. However you simply cannot achieve the same breadth of marks with a synthetic brush.

Historically, paint brushes have been made with hog bristle or other animal hair, such as sable. Brushes made of hog hair or other natural fibers tend to have a firmer bounce. They are durable and ideal for working with thick, heavybodied watercolour paints. Sable brushes are made from the tail hair of the kolinsky, a species of weasel.

Often made of nylon or polyester, synthetic brushes can have a range of bounces depending on their design. Some synthetic brushes are designed to mimic the bounce of natural bristles.

Bristle length and thickness

Longer and thinner bristles generally provide more flexibility and less bounce, creating softer strokes. Shorter and thicker bristles offer more control and a firmer bounce, making them suitable for detailed work.

If you're new to watercolour, don't stop here! Explore our other beginner-friendly guides to learn all you need to progress and develop your watercolour skills.

Brush shape

Round or pointed brushes typically have a softer bounce, useful for fine details or delicate lines. Flat brushes often have more resilience and firmness, ideal for bold, controlled strokes and blending. The stiffness of the ferrule (the metal band that holds the bristles) and the handle's weight can also influence how the bounce feels.

How to choose your first brushes

When buying your first set, consider:

• Handle length: Watercolour brushes usually have short handles for close work
• Spring: A good brush springs back into shape after each stroke
• Point: A high-quality round brush should hold a sharp tip
• Budget: Synthetics offer great value for beginners without sacrificing quality
• Try before you buy: If you can, test how the brush feels in your hand and how it snaps back after wetting.
• Start with: 2–4 brushes in different shapes
• A solid starter kit might be: Round #6 or #8 – for most techniques, Round #2 – for fine detail, Flat 1" – for washes and backgrounds
• Add: new brushes gradually as your technique grows

Learn how to look after your new watercolour brushes with our top five steps to cleaning your watercolour brushes

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