The 6 Best Brushes for Watercolour & Gouache (And When to Use Them!)

You're ready to paint, brush in hand... but then you pause.

With so many brushes, which one is right for the job?

True!  Picking the right brush for watercolour or gouache changes how your painting turns out. 

Some create crisp lines, others melt colours together. 

This means, the right choice can make painting feel effortless.

Whether in watercolour and gouache, brush control is everything. 

Knowing how each one works helps you paint with confidence and skip the frustration.

Brush Shapes & When to Use Them

Different brushes create different effects. 

Here’s a breakdown of the best brushes for watercolour and gouache:

Round Brush – The all-rounder. Holds lots of water and works for both fine details and broad strokes.

✅ Best for: Petals, leaves, line work, blending.

Our favourite round brush? The Size 12 Bamboo Brush — sustainable, cruelty-free, durable, and crafted for proven quality and performance. 🌿✨ Get yours here! 🎨

Flat Brush – Sharp edges and bold strokes. Great for filling space.

✅ Best for: Sky washes, backgrounds, geometric shapes.

Looking for the perfect flat brushes? We recommend Sarah's Duo Brush Set with 3/4" and 3/8" flat brushes — versatile, durable, and designed for smooth, even strokes 🖌️✨ Click here

Filbert Brush – A mix of round and flat. Blends softly for natural strokes.

✅ Best for: Florals, skin tones, shading.

Fan Brush – Adds quick texture. Think grass, fur, trees.

✅ Best for: Foliage, hair, textures.

Need to elevate your brush game? Here's Sarah's Duo Brush Set featuring a Filbert and Fan Brush — perfect for creating soft edges, textures, and delicate blends. 🖌️✨ Ready to try them out? Get yours here!

Angle Brush – Precise, slanted strokes for sharp details.

✅ Best for: Sharp edges, lettering.

Unlock new angles in your art! The Emma Lefebvre Duo Brush Set features a Size 12 Angle Brush. Plus, you'll get a Size 4 Round Brush for those fine details. 🖌️✨ Grab yours now!

Rigger/Liner Brush – Extra-long bristles for flowing, delicate lines.

✅ Best for: Tree branches, fine details, signatures.

The Sarah Burns Duo Brush Set features a Size 1 Rigger Brush and you'll also get a Size 14 Mop Brush for effortless washes and blending. 🖌️✨ Click here!

Watercolour vs. Gouache: How Brushes React Differently

Watercolour needs soft, flexible brushes for smooth, flowing washes.

On the other hand, gouache needs more control since it’s opaque and builds in layers.

For example:

A round brush in watercolour makes soft, airy blends. In gouache, it gives thick, solid strokes.

A flat brush in watercolour creates smooth transitions, but in gouache?  It builds strong, bold layers.

💡 Tip: Use separate brushes for watercolour and gouache if you paint often. It keeps them in better shape.

Common Brush Mistakes & Easy Fixes

Even pros make these mistakes. 

Here’s how to avoid them:

❌ Too much paint, not enough water – This leads to streaky strokes.

✅ Fix: Blot your brush for watercolour; mix gouache to a creamy consistency.

❌ Pressing too hard – This action spreads bristles and ruins control.

✅ Fix: Use a light touch and let the brush do the work.

❌ Not cleaning brushes – Dried paint = ruined bristles.

✅ Fix: Rinse, reshape, and store brushes upright or flat.

❌ Not rinsing between colors – This leads to muddy, dull mixes.

✅ Fix: Swish your brush in clean water; for gouache, wipe on a paper towel before reloading.

💡 Pro Tip: Always test new brushes on scrap paper first!

Final Thoughts

Using the right brush makes painting easier.  It gives you smoother blends, crisp details, and better control.

🎥 Want to see these brushes in action? Watch our tutorial 

💬 Which brush is your go-to? Drop a comment below and let us know!