Watercolour Brushes: Rounds, Mops, Flats and Water Brushes

Posted by

Haanz Team

2026-10-18

On 2026-10-18

Haanz Art GuideFree, practical advice from the team at Haanz Art & Craft Materials

In watercolour, the brush does a lot of the work: it carries water and colour to the paper and controls how the paint flows. This guide to watercolour brushes explains the main shapes (round, mop, flat and water brush), sable and synthetic hair, which sizes to start with, and how to keep your brushes in good shape.

What makes a good watercolour brush?

Holds plenty of water: so you can paint a whole wash without reloading.
Keeps a fine point: so one brush can paint both broad areas and fine lines.
Springs back: soft hair that returns to shape after each stroke.

Watercolour brush shapes

Round: the most useful watercolour brush. Pressed down, it makes broad strokes; on its tip, fine lines.
Mop: a full, rounded head that holds a lot of water and colour, for large, soft washes and skies.
Flat: straight edge for even washes, buildings and crisp edges.
Water brush: a brush with water stored in the handle, ideal for sketching on the go. See our water brush guide.

Watercolour brushes we stock

Apple Fine Red Sable rounds: natural red sable for watercolour and gouache, in sizes 000, 0, 2, 4, 6, 8 and 10.
Synthetic rounds: the Flash Synthetic Hair Round (sizes 000 to 20) and the DOMS Studio Round (000 to 12), sold by size.
Mops: the Crimto Watercolour Quill Mop in size 3 and size 6, with a quill-style head and a fine point.
Flats: the Flash Synthetic Hair Flat in sizes 1 to 20.
Water brushes: the Sakura Water Brush in small, medium or large, and the Water Brush Pen 6 Set.

Prices change, so see each product page for today’s price. Browse all brushes for watercolour and acrylic.

Sable or synthetic?

Red sable: natural hair that holds water well and keeps a lovely point. Traditionally the favourite for watercolour.
Synthetic: durable, easy to clean and good value. Modern synthetics perform well, and they also suit gouache and acrylic.
Many painters own one or two sable rounds for detail and synthetic brushes for everything else.

Which watercolour brushes to buy first

A medium round, such as size 6 or 8, for most of the painting.
A small round, such as size 0 or 2, for details.
A mop or large flat for big washes and skies.

That small set covers most beginner paintings. See our watercolour techniques guide for exercises to try with them.

Testing a brush’s point

Dip the brush in water, flick off the excess and look at the tip. A good watercolour round should come to a single, neat point. Paint a few lines on scrap paper, pressing lightly then firmly: you should be able to go from a hair-thin line to a broad stroke with one brush.

Caring for watercolour brushes

Rinse in clean water after use and gently reshape the point with your fingers.
Dry them flat or tip-up; never leave brushes standing on their tips in water.
Keep watercolour brushes for watercolour; acrylic paint can dry in the hairs and spoil the point.
Store them where the tips are protected, such as in a brush roll or a jar, tip-up.

Frequently asked questions

Can one brush do everything?

A good medium round comes close: it paints washes when pressed and details on its tip.

What is a quill mop brush?

A mop brush with a full, rounded head that holds plenty of water but also comes to a point, so it can paint both washes and some detail.

Are water brushes good for beginners?

Yes, especially for sketching and travel, though a normal brush and water jar are easier for big, wet washes.

Do you deliver islandwide?

Yes. We deliver across Sri Lanka in 2–5 working days, with cash on delivery, card or bank transfer. You can also visit our shops in Boralesgamuwa and Horana, open every day from 9 AM to 6 PM.

Not sure what to choose? WhatsApp the Haanz team on 0711 515 515 and we’ll help you choose watercolour brushes.

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