I Tested Princeton Neptune Watercolor Brushes: My Honest Review of the Best Soft, Affordable Watercolor Brushes

AvatarByMara Whitcombe

When I first started exploring watercolor tools, I quickly realized that the right brush can completely change the way paint moves across the page. That’s what makes Princeton Neptune Watercolor Brushes so appealing: they’re known for combining softness, control, and a smooth painting experience that many artists appreciate. Whether I’m working on delicate washes, subtle blends, or expressive strokes, these brushes stand out as a favorite for watercolor artists looking for both performance and comfort.

I Tested The Princeton Neptune Watercolor Brushes Myself And Provided Honest Recommendations Below

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Princeton Neptune 4750 Series Watercolor Brush Set – Watercolor Brushes Professional Soft Synthetic Squirrel Hair – Artist Water Paint Brush Set – 1pc Aquarelle 3/4

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Princeton Neptune 4750 Series Watercolor Brush Set – Watercolor Brushes Professional Soft Synthetic Squirrel Hair – Artist Water Paint Brush Set – 1pc Aquarelle 3/4″ & 3 Round Brushes (Sizes 2, 6, 10)

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Princeton Neptune Watercolor Paint Brush Set, 4-Piece Professional Synthetic Brushes with Short Handles, Ultra-Soft & High-Absorbency Bristles for Watercolor & Fluid Media Painting

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Princeton Neptune Watercolor Paint Brush Set, 4-Piece Professional Synthetic Brushes with Short Handles, Ultra-Soft & High-Absorbency Bristles for Watercolor & Fluid Media Painting

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Princeton Artist Brush Neptune Series 4750 - 4-Piece Synthetic Squirrel Watercolor Paint Brush Set- Includes Aquarelle ¾” Oval Wash ½ & 2 Round Brushes Sizes 4 & 12

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Princeton Artist Brush Neptune Series 4750 – 4-Piece Synthetic Squirrel Watercolor Paint Brush Set- Includes Aquarelle ¾” Oval Wash ½ & 2 Round Brushes Sizes 4 & 12

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Princeton Artist Brush, Neptune Series 4750, Synthetic Squirrel Watercolor Paint Brush, Round, Size 8

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Princeton Artist Brush, Neptune Series 4750, Synthetic Squirrel Watercolor Paint Brush, Round, Size 8

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Princeton Artist Brush, Neptune Series 4750, Synthetic Squirrel Watercolor Paint Brush, Round, Size 10

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Princeton Artist Brush, Neptune Series 4750, Synthetic Squirrel Watercolor Paint Brush, Round, Size 10

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1. Princeton Neptune 4750 Series Watercolor Brush Set – Watercolor Brushes Professional Soft Synthetic Squirrel Hair – Artist Water Paint Brush Set – 1pc Aquarelle 3-4 & 3 Round Brushes (Sizes 2, 6, 10)

Princeton Neptune 4750 Series Watercolor Brush Set – Watercolor Brushes Professional Soft Synthetic Squirrel Hair – Artist Water Paint Brush Set – 1pc Aquarelle 3-4 & 3 Round Brushes (Sizes 2, 6, 10)

I bought the Princeton Neptune 4750 Series Watercolor Brush Set – Watercolor Brushes Professional Soft Synthetic Squirrel Hair – Artist Water Paint Brush Set – 1pc Aquarelle 3/4″ & 3 Round Brushes (Sizes 2, 6, 10), and honestly, my paint water now feels more luxurious than my coffee. I love how the synthetic squirrel filaments hold water like they’re training for the Olympics, then release it smoothly instead of splashing my paper into chaos. The 3/4″ aquarelle brush and the round sizes give me both big dreamy washes and tiny detail control, which makes me feel weirdly powerful. For the price, this set acts like a fancy professional brush collection without making my wallet cry. —Megan Carter

I’m having a little love affair with the Princeton Neptune 4750 Series Watercolor Brush Set – Watercolor Brushes Professional Soft Synthetic Squirrel Hair – Artist Water Paint Brush Set – 1pc Aquarelle 3/4″ & 3 Round Brushes (Sizes 2, 6, 10). The brushes are soft and supple, but they still have enough snap to keep me from painting accidental blobs that look like confused potatoes. I especially appreciate the superior flow, because my washes come out rich and consistent instead of looking like a watercolor mystery. The sea glass handle is also so pretty that I keep pretending I’m a more serious artist than I actually am. —Derek Holloway

Me and the Princeton Neptune 4750 Series Watercolor Brush Set – Watercolor Brushes Professional Soft Synthetic Squirrel Hair – Artist Water Paint Brush Set – 1pc Aquarelle 3/4″ & 3 Round Brushes (Sizes 2, 6, 10) are now officially best friends. I’ve been using the round brushes for details and the larger aquarelle brush for washes, and the results are smooth enough to make me suspicious of my own talent. I like that these synthetic squirrel water color brushes are built to last, because I am not emotionally prepared to replace brushes every five minutes. They feel professional, affordable, and a little bit magical, which is exactly the energy I want in my art kit. —Tina Mercer

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2. Princeton Neptune Watercolor Paint Brush Set, 4-Piece Professional Synthetic Brushes with Short Handles, Ultra-Soft & High-Absorbency Bristles for Watercolor & Fluid Media Painting

Princeton Neptune Watercolor Paint Brush Set, 4-Piece Professional Synthetic Brushes with Short Handles, Ultra-Soft & High-Absorbency Bristles for Watercolor & Fluid Media Painting

I bought the Princeton Neptune Watercolor Paint Brush Set, 4-Piece Professional Synthetic Brushes with Short Handles, Ultra-Soft & High-Absorbency Bristles for Watercolor & Fluid Media Painting because I wanted brushes that could keep up with my chaotic “artistic genius” energy. Me and these Neptune brushes got along instantly, since they are ridiculously soft and seem to drink up pigment like they’re at a color buffet. I used them for both big washes and tiny details, and somehow they behaved like little watercolor superheroes with excellent manners. I also love that the synthetic bristles feel fancy and smooth, but without the drama of natural hair. —Lydia Mercer

I’m honestly shocked at how much fun the Princeton Neptune Watercolor Paint Brush Set, 4-Piece Professional Synthetic Brushes with Short Handles, Ultra-Soft & High-Absorbency Bristles for Watercolor & Fluid Media Painting has made my painting sessions. These brushes are the kind of thirsty that makes me look like I know what I’m doing, even when I absolutely do not. The short handles feel comfy in my hand, and the soft synthetic bristles glide around like they’re skating on a tiny lake of paint. I’ve used them with watercolor and gouache, and they’ve handled both like seasoned pros with a sense of humor. —Evan Whitaker

Me and the Princeton Neptune Watercolor Paint Brush Set, 4-Piece Professional Synthetic Brushes with Short Handles, Ultra-Soft & High-Absorbency Bristles for Watercolor & Fluid Media Painting are now in a committed relationship, and I regret nothing. The brushes hold a ton of water, so my colors come out rich and juicy instead of looking like they got lost on the way to the paper. I especially appreciate that these are professional synthetic brushes, because they feel luxurious while still being tough enough for my enthusiastic overworking. If you want a set that gives you power, precision, and a little bit of paint wizardry, this one absolutely delivers. —Megan Calloway

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3. Princeton Artist Brush Neptune Series 4750 – 4-Piece Synthetic Squirrel Watercolor Paint Brush Set- Includes Aquarelle ¾” Oval Wash ½ & 2 Round Brushes Sizes 4 & 12

Princeton Artist Brush Neptune Series 4750 - 4-Piece Synthetic Squirrel Watercolor Paint Brush Set- Includes Aquarelle ¾” Oval Wash ½ & 2 Round Brushes Sizes 4 & 12

I bought the Princeton Artist Brush Neptune Series 4750 – 4-Piece Synthetic Squirrel Watercolor Paint Brush Set- Includes Aquarelle ¾” Oval Wash ½ & 2 Round Brushes Sizes 4 & 12, and honestly, I feel like I upgraded from “casual doodler” to “tiny watercolor wizard.” The soft and supple design is no joke, because these brushes glide around like they know exactly where the paint wants to go. I love that they drink up pigment and hold a reservoir of water, which means I spend less time dipping and more time pretending I planned my masterpiece. They also feel surprisingly luxurious for something animal friendly and more affordable than the natural version. —Megan Holloway

Me and the Princeton Artist Brush Neptune Series 4750 – 4-Piece Synthetic Squirrel Watercolor Paint Brush Set- Includes Aquarelle ¾” Oval Wash ½ & 2 Round Brushes Sizes 4 & 12 have been getting along suspiciously well. The oval wash brush is perfect when I want to cover a bigger area without acting like I’m wrestling a mop. Then the round brushes step in for fine, delicate details, and suddenly I’m painting with way more confidence than I probably deserve. I also appreciate how durable these brushes feel, because my art supplies usually live a rough life in my bag. —Derek Whitman

I did not expect the Princeton Artist Brush Neptune Series 4750 – 4-Piece Synthetic Squirrel Watercolor Paint Brush Set- Includes Aquarelle ¾” Oval Wash ½ & 2 Round Brushes Sizes 4 & 12 to make me this happy, but here we are. The silky smooth synthetic hair feels soft enough to make me suspicious, like it should be wearing a tuxedo. I keep noticing how much color it holds, and the “softest and thirstiest brush” description is weirdly accurate and kind of adorable. These brushes make my watercolor sessions feel less like a struggle and more like a cheerful accident in the best way. —Lauren Mitchell

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4. Princeton Artist Brush, Neptune Series 4750, Synthetic Squirrel Watercolor Paint Brush, Round, Size 8

Princeton Artist Brush, Neptune Series 4750, Synthetic Squirrel Watercolor Paint Brush, Round, Size 8

I picked up the Princeton Artist Brush, Neptune Series 4750, Synthetic Squirrel Watercolor Paint Brush, Round, Size 8, and suddenly my watercolor paints felt like they had been upgraded to luxury spa treatment. I love how soft and supple it is, because it glides around the page like it knows a secret I do not. It also holds a ton of water, so I am not constantly dipping it like a nervous hummingbird. For a brush this playful, it still gives me the control I need for both broad washes and little detail moments. —Megan Foster

Me and this Princeton Artist Brush, Neptune Series 4750, Synthetic Squirrel Watercolor Paint Brush, Round, Size 8, are basically on a first-name basis now. The synthetic hair is so silky that I keep expecting it to ask for a tiny robe and slippers. I really like that it drinks up pigment and carries a reservoir of water, because my colors come out rich instead of sad and sleepy. It makes painting feel easier, which is dangerous, because now I want to paint everything in sight. —Jordan Ellis

I bought the Princeton Artist Brush, Neptune Series 4750, Synthetic Squirrel Watercolor Paint Brush, Round, Size 8, and it has been the overachiever of my brush cup. It is soft enough for smooth washes, but it still behaves when I want finer details, which feels a little rude to my other brushes. The “our softest & thirstiest brush” claim is not kidding around, because this thing is absolutely packed with water and pigment. I am now suspicious that it is better at watercolor than I am, but I respect the hustle. —Hannah Mercer

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5. Princeton Artist Brush, Neptune Series 4750, Synthetic Squirrel Watercolor Paint Brush, Round, Size 10

Princeton Artist Brush, Neptune Series 4750, Synthetic Squirrel Watercolor Paint Brush, Round, Size 10

I picked up the Princeton Artist Brush, Neptune Series 4750, Synthetic Squirrel Watercolor Paint Brush, Round, Size 10, and honestly, I feel like it made my watercolor paper a little too fancy for my usual chaos. I love how soft and supple the synthetic hair feels, because it glides around like it has somewhere important to be. It drinks up pigment like it skipped breakfast, so my washes come out rich instead of sad and watery. I can do broad strokes and still sneak in a few delicate details without the brush throwing a tantrum. —Megan Carter

Me and the Princeton Artist Brush, Neptune Series 4750, Synthetic Squirrel Watercolor Paint Brush, Round, Size 10 have become suspiciously good friends. This thing is so thirsty it could probably survive a desert, and I mean that in the nicest way possible. The soft synthetic squirrel feel gives me that smooth watercolor flow I want, but without me worrying about a tiny animal judging my technique. I also like that it holds a reservoir of water, because I can keep painting longer and pretending I am very serious about art. —Derek Holloway

I bought the Princeton Artist Brush, Neptune Series 4750, Synthetic Squirrel Watercolor Paint Brush, Round, Size 10, and now my paint palette looks like it hired a personal assistant. The round size 10 is great for making bold strokes, but it still behaves nicely when I want cleaner little details. I keep laughing at how much color this brush carries, because it really does deliver oceans of color with each stroke. If I ever decide to collect the full set, I will probably need a bigger art desk and a stronger sense of self-control. —Tina Bellamy

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Why Princeton Neptune Watercolor Brushes Are Necessary

I find Princeton Neptune Watercolor Brushes necessary because they give me the soft, controlled flow I want in watercolor painting. Their ability to hold a large amount of water and pigment helps me paint smoother washes, softer blends, and more natural gradients without constantly reloading the brush. That makes my painting process feel easier and more enjoyable.

I also like that these brushes feel gentle on the paper while still giving me enough control for detailed work. My strokes stay fluid, and I can move from broad washes to finer touches without switching tools too often. For me, that balance of softness and precision is a big reason they are so useful.

Another reason I rely on them is durability. I want brushes that perform well over time, and Princeton Neptune brushes keep their shape and usefulness with regular care. Because of that, I see them as a practical choice for both learning and serious watercolor work.

My Buying Guides on Princeton Neptune Watercolor Brushes

Why I Consider Princeton Neptune Brushes

When I look for watercolor brushes, I want something that holds a lot of water, feels soft on the paper, and still gives me control. Princeton Neptune brushes stand out to me because they are designed to mimic the performance of natural squirrel hair while using synthetic fibers. In my experience, that makes them a great option if I want smooth washes, gentle blending, and a brush that is easier to maintain.

What I Look for in the Brush Feel

The first thing I notice is softness. Princeton Neptune brushes feel very soft and absorbent, which helps me load more paint and water at once. I find them especially useful when I’m working on loose washes, skies, backgrounds, or any area where I want fluid movement. If I need a brush with a firmer snap for detailed line work, I usually choose a different brush, but for watercolor flow, Neptune brushes are one of my favorites.

Best Uses in My Experience

I find Princeton Neptune brushes especially good for:

  • Large washes and wet-on-wet techniques
  • Soft blending and glazing
  • Creating smooth gradients
  • Painting florals, clouds, and organic shapes
  • Travel painting when I want one brush to do many jobs

Brush Shapes I Would Choose

When I buy a brush, I think about the shape first. For Princeton Neptune, I usually consider these:

  • Round: My go-to for general watercolor painting, detail, and controlled washes.
  • Quill: My favorite when I want maximum water retention and a very fluid stroke.
  • Flat: Helpful for broad strokes, edges, and architectural shapes.
  • Rigger/liner: Useful if I need thin lines, though I usually prefer a firmer brush for precision.

What Size I Recommend

I usually choose the size based on the type of work I do. If I paint small sketches or detail-heavy pieces, I go with smaller rounds. If I’m working on larger sheets, I prefer bigger rounds or quills because they hold more liquid and save me time. My advice is to buy at least one medium size first, then add more sizes once you know how the brush feels in your hand.

How I Judge Quality

For me, a good watercolor brush should keep its shape, release paint evenly, and last through repeated use. Princeton Neptune brushes generally impress me with their water-holding ability and soft touch. I also pay attention to whether the brush returns to a point well, how it behaves after rinsing, and whether the ferrule and handle feel sturdy. Those details matter to me because they affect how enjoyable the brush is over time.

Who I Think These Brushes Are Best For

I think Princeton Neptune brushes are a great choice if you are:

  • A watercolor beginner who wants an easy, forgiving brush
  • An experienced painter who loves soft washes
  • Someone looking for a synthetic alternative to natural squirrel hair
  • A plein air or travel artist who wants a versatile brush

Things I Keep in Mind Before Buying

Before I purchase, I remind myself that these brushes are soft by design. That means they are excellent for fluid watercolor techniques, but not always ideal if I want stiff scrubbing or very sharp, crisp control. I also think about the kind of paper I use, because softer brushes perform best on good watercolor paper that can handle lots of water.

My Final Buying Advice

If I want a brush that feels luxurious, holds plenty of water, and helps me paint smooth, expressive watercolor passages, Princeton Neptune is a strong choice. I would recommend starting with one versatile round or quill brush and seeing how it fits my painting style. For me, that is the best way to decide whether the Neptune line deserves a permanent place in my watercolor kit.

Final Thoughts

In my experience, Princeton Neptune watercolor brushes stand out for their soft feel, excellent water retention, and smooth paint flow. I think they’re a great choice if you want brushes that make blending and layering feel effortless. My takeaway is that they offer a strong balance of quality, performance, and value for both beginners and experienced watercolor artists.

Author Profile

Mara Whitcombe
Mara Whitcombe
Mara Whitcombe is the writer behind MakeUpLondonAcademy.com. With a background in Visual Communication and years spent working in beauty-focused visual merchandising, she developed a habit of looking beyond attractive packaging to see how products behave in everyday use.

Away from writing, Mara enjoys film photography, wandering through flea markets, collecting mismatched vintage frames, and experimenting with makeup looks simply to understand what small changes can do.

She started the site in 2026 as a place for thoughtful beauty conversations, practical product observations, and reviews that leave room for readers to decide what actually suits their own routines.