You have a jar full of synthetic acrylic brushes and a fresh set of watercolor pans. The obvious question: can you use acrylic brushes for watercolor, or do you need a whole new brush collection first? Short version: no, but the brushes will behave differently from purpose-made watercolor brushes, and knowing why helps you pick the right ones from the jar and avoid a few frustrating results.
Quick answer: Yes, you can use acrylic brushes for watercolor, especially soft synthetic ones. They will hold less water and feel springier than dedicated watercolor brushes, so washes run dry sooner and gradients take more reloading. Use clean brushes that have never had dried acrylic in the heel, keep them separate from your acrylic set once they cross over, and choose the softest, roundest ones you own for wet work.
Can You Use Acrylic Brushes for Watercolor? The Longer Answer
Paint does not care what the label on the handle says. What matters is how the hair (or filament) holds and releases liquid, how it snaps back to shape, and whether the tip forms a point. Acrylic brushes are designed for a thicker, stickier paint that dries quickly and can be harsh on natural hair, so most of them use synthetic filaments with more stiffness than a typical watercolor brush.
That stiffness is the main trade-off. Watercolor is mostly water, and a good watercolor brush works like a reservoir: it soaks up a big load and lets it out slowly as you drag the brush across paper. A firmer acrylic brush tends to dump its load faster or hold less in the first place. You can still paint with it. You just reload more often and adapt your technique.
There is a second consideration that matters more than many people expect: residue. Acrylic paint that dries inside the ferrule turns into plastic. A brush with old acrylic in the heel splays, will not point, and can shed flakes into a wash. If your acrylic brushes are well cleaned, they are fair game. If they are crusty at the base, they are better retired to texture work.
Watercolor Brushes vs Acrylic Brushes: What Actually Differs
The table below compares the typical design goals of each category. Individual brushes vary a lot, and some synthetic lines are sold as suitable for both, so treat this as a general pattern rather than a rule.
| Feature | Typical watercolor brush | Typical acrylic brush |
|---|---|---|
| Filament | Soft natural hair (sable, squirrel, goat) or soft synthetic blends | Synthetic nylon or polyester (often called Taklon), sometimes hog bristle |
| Water capacity | High; designed to hold a large reservoir | Lower; designed to push thicker paint |
| Spring (snap) | Soft to medium | Medium to firm |
| Point on rounds | Fine, reliable point when wet | Varies; firmer rounds point well, worn ones often do not |
| Handle | Usually short | Short or long (long handles suit easel work) |
| Durability under rough use | Natural hair is delicate | Built to tolerate scrubbing and quick-drying paint |
| Best watercolor uses | Washes, glazes, wet-in-wet, gradients | Detail, dry brush, lifting, controlled edges |
The pattern to notice: acrylic brushes lose ground on big, wet tasks and hold their own, or even win, on dry and controlled tasks. That should guide which ones you reach for. If you later want brushes built around a big reservoir, our guide to dedicated watercolor brushes worth owning shows what to look for.
Which Acrylic Brushes Work Best for Watercolor
Not every brush in an acrylic set crosses over equally well. Sort through what you own using these guidelines.
Good candidates
- Soft synthetic rounds, sizes 4 to 12. These are the closest thing to a watercolor round. Wet one, flick it once, and check that it forms a point. If it does, it can handle most everyday watercolor work.
- Soft synthetic flats and one-stroke brushes, 1/2 to 1 inch. Useful for skies, backgrounds and laying in shapes with clean edges.
- Small liners and detail brushes. Detail work does not need a big reservoir, so the firmness of acrylic filaments rarely hurts here. A liner with a longer head still carries enough paint for branches and rigging lines.
- Angled shaders. Handy for petals, leaves and corners where you want a crisp edge on one side and a softer one on the other.
Poor candidates
- Stiff hog bristle brushes for general painting. They grab little water and leave streaky, broken marks. Keep them for lifting and scrubbing instead (more on that below).
- Brushes with dried acrylic in the heel. They will splay and leave unwanted lines.
- Tiny flats for washes. A small flat runs dry halfway across a sky, leaving hard stripes.
How to Paint Watercolor With Acrylic Brushes: Practical Adjustments
A few changes to your routine make acrylic brushes far more cooperative with watercolor.
- Pre-soak the brush. Leave the head in clean water for 30 to 60 seconds before the first stroke. Synthetic filaments do not absorb water internally the way natural hair does, but wetting the whole head lets the spaces between filaments fill completely, which gives you a slightly bigger working load.
- Size up. If you would normally use a size 8 watercolor round for a passage, try a 10 or 12 acrylic round. A larger head compensates for lower per-filament capacity.
- Mix more paint than you think you need. Because you reload more often, running out of a mixed color mid-wash is a real risk. Mix a full puddle first.
- Work at a slight tilt. Tilting the board 10 to 20 degrees keeps a bead of paint moving down the wash, so each new stroke picks up the wet edge of the last one even when the brush carries less.
- Reload before the brush is empty. Do not wait until the stroke turns scratchy. Reload when you feel the drag increase. This keeps the wet edge alive and prevents backruns, also called blooms or cauliflowers.
- Use lighter pressure. Firm filaments can scrub the paper surface if you press. Let the tip glide.
Where Acrylic Brushes Actually Shine in Watercolor
Firmness is not purely a drawback. Some watercolor techniques benefit from a brush that releases less water and holds its shape under pressure.
Dry Brush Watercolor Technique
Dry brush means loading a brush with paint but very little water, blotting it on a paper towel, then dragging it lightly across textured paper so color catches only on the high points. It is ideal for tree bark, weathered wood, sparkle on water and grassy fields. A firm synthetic flat or a slightly worn acrylic round is excellent for this, because it naturally holds less liquid and its stiffer filaments separate into broken marks. Cold-press or rough paper gives the best texture.
Lifting and Correcting
Watercolor can often be partly removed by rewetting and blotting. Soft brushes struggle to loosen pigment that has settled into the paper. A stiffer acrylic brush, used with clean water and gentle circular motion, lifts more effectively. Blot immediately with a clean tissue. Staining pigments such as phthalo blue and some quinacridones will not lift fully no matter what brush you use.
Hard-Edged Shapes
Architecture, botanical outlines and geometric designs often look better with crisp boundaries. A springy flat or angled brush keeps its edge under pressure, so you can paint a clean line without the head flaring.
What Is a Watercolor Scrubber Brush (and Can an Acrylic Brush Stand In)?
A scrubber is a short, stiff, usually synthetic brush made specifically to lift dried watercolor from paper. The filaments are trimmed short so they have enough backbone to loosen pigment without needing heavy pressure. Some have a slightly oval or rounded shape for softening edges, while others are flat or have a fine edge for lifting thin highlights such as a ray of light or a stem.
A small, firm acrylic flat that has been trimmed or worn down can act as a stand-in scrubber. Many painters keep an old acrylic brush exactly for this job. The process: wet the area, wait a few seconds, scrub gently, then blot. Repeat in short rounds rather than one heavy session, since aggressive scrubbing can pill the paper surface and make later washes look patchy.
Common Mistakes When Using Acrylic Brushes for Watercolor
- Switching back and forth between mediums with the same brush. Traces of acrylic binder left in the filaments can make watercolor behave oddly, and acrylic can build up in the ferrule over time. Once a brush becomes a watercolor brush, let it stay one.
- Using too small a brush for washes. This is the most common cause of streaky skies. Go bigger.
- Pressing too hard. Firm brushes scuff paper. Scuffed areas absorb paint unevenly and appear darker.
- Judging the brush when dry. Synthetic brushes often look fluffy and shapeless out of the jar. Always test the point and spring after wetting.
- Blaming the brush for paper problems. Thin, low-cotton paper buckles and resists smooth washes regardless of the brush. Heavier paper (around 140 lb / 300 gsm) improves results noticeably.
How to Clean Watercolor Brushes (Including Converted Acrylic Ones)
Watercolor is reactivated by water, so cleaning is easier than with acrylic. Still, pigment and gum arabic accumulate near the ferrule if you only swish and walk away.
- Rinse the brush in clean water until no color runs out. Use two water jars while painting, one for the first rinse and one for clean water, to keep washes from turning muddy.
- Every few sessions, wash gently with a mild soap or brush soap. Work a little lather into the head with your fingers, paying attention to the base of the filaments.
- Rinse until the water runs completely clear.
- Squeeze out excess water with a towel and reshape the head with your fingers to its natural point or edge.
- Dry flat or with the head pointing down. Standing a wet brush head-up lets water run into the ferrule, which can loosen glue and swell wooden handles.
Avoid hot water, which can loosen ferrule glue, and never leave any brush standing on its tip in a water jar. Synthetic filaments can bend permanently, and once a round loses its point it becomes far less useful for watercolor.
Watercolor Brushes for Beginners: When Is It Worth Buying Dedicated Ones?
Starting with acrylic brushes you already own is completely reasonable. It lets you learn color mixing, value and water control before spending money. Signs that it is time to add a few dedicated watercolor brushes include:
- Your washes keep drying in stripes even when you size up and work at a tilt.
- You want to paint wet-in-wet skies or large loose florals, which depend on a big reservoir.
- Your rounds will not hold a point, making fine details frustrating.
- You find yourself reloading after every one or two strokes.
You do not need a large set. A practical starter trio for watercolor is a medium round (size 8 to 10), a larger round or a mop for washes, and a 1/2 to 3/4 inch flat. Soft synthetic or synthetic-blend brushes are a sensible middle ground between natural hair and firm acrylic filaments. If you are comparing specific options, our roundup of Jackson’s watercolor brushes covers which shapes and lines suit different budgets.
How to Craft a Brush for Watercolor (Quick DIY Options)
If you like experimenting, homemade brushes can add texture that commercial brushes cannot. These are fun supplements, not replacements.
- Feather or grass brush: Bind a bundle of feathers, dried grass or pine needles to a chopstick with thread and a dab of glue. Great for loose foliage marks.
- Trimmed acrylic brush: Cut an old flat into a rake or fan shape with sharp scissors for grass and hair textures.
- Sponge dabber: Wrap a small piece of natural or synthetic sponge around a stick for foliage and stone textures.
Rinse homemade tools well after use, and do not expect a point or a large reservoir from them.
FAQs
Can you use acrylic brushes for watercolor painting?
Yes. Soft synthetic acrylic brushes work well for watercolor, particularly for details, dry brush and lifting. They hold less water than dedicated watercolor brushes, so you will reload more often during washes.
Can you use the same brush for acrylic and watercolor?
It is possible, but it is better to dedicate each brush to one medium. Acrylic residue can build up in the ferrule and affect how watercolor flows and how well the brush points.
What is the difference between watercolor brushes and acrylic brushes?
Watercolor brushes are softer and designed to hold a large load of water and release it slowly. Acrylic brushes are firmer and more durable to push thicker, faster-drying paint.
Are synthetic brushes good for watercolor?
Yes. Modern soft synthetics hold a good point and are durable and affordable. Natural hair still tends to hold more water, but many painters use synthetics successfully for all their work.
What is a watercolor scrubber brush used for?
A scrubber is a short, stiff brush used to lift dried watercolor from paper to correct mistakes, soften edges or create highlights. A small firm acrylic flat can serve the same purpose.
Can I use hog bristle acrylic brushes for watercolor?
Not for general painting, since they hold little water and leave streaky marks. They are useful for lifting, scrubbing and rough dry-brush textures.
Next Step
Start with the softest synthetic rounds and flats you already own, size up for washes, and keep a firm old brush aside for lifting and dry brush. Once you notice your brushes limiting your washes or details, that is the right time to invest. For specific recommendations, see our Jackson’s watercolor brush review and best picks, which compares shapes, hair types and value for everyday painting.
