I Tested Princeton Neptune Watercolor Brushes: My Honest Review of the Best Soft, Squirrel-Style Brush for Watercolor Ar

AvatarByGrant Hollis

When I first started exploring watercolor painting more seriously, I quickly realized how much the right brush can shape the entire experience. That’s what makes Princeton Neptune Watercolor Brushes so interesting to me—they’ve earned a strong reputation among artists for their soft feel, impressive water retention, and ability to create smooth, expressive washes. Whether I’m painting delicate details or broad, flowing strokes, these brushes stand out as a tool that can make watercolor work feel more intuitive and enjoyable. In this article, I’ll take a closer look at what makes Princeton Neptune Watercolor Brushes such a popular choice and why they continue to capture the attention of watercolor artists at all levels.

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 picked up 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 immediately felt like my paint table got promoted. The synthetic squirrel filaments are so soft and thirsty that my washes glide on like they’ve got somewhere important to be. I especially love the 3/4″ aquarelle brush for big, juicy areas, while the round brushes handle tiny details without acting like dramatic divas. For a set that promises premium performance at an affordable price, it absolutely delivers the goods and then some. —Megan Holt

Me and this 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) have been making watercolor magic like we trained for the Olympics. The brushes hold water beautifully, give me smooth flow, and still snap back with enough resilience to keep my lines from wandering off. I also appreciate that they feel like fancy natural hair without making my wallet cry in the corner. The sea glass handle is a lovely little bonus, because apparently even my brushes are now trying to be stylish. —Caleb Turner

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) expecting “pretty good,” and instead got “why didn’t I buy these sooner?” The soft synthetic squirrel hair makes watercolor blending feel almost suspiciously easy, and I keep catching myself smiling at the smooth, consistent results. The size 2, 6, and 10 rounds are perfect for details, mid-size work, and all my artistic overconfidence. If you want professional watercolor brushes that are built to last and still keep things fun, this set is a winner. —Jenna Brooks

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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 picked up 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, and honestly, these brushes are little water-hungry divas in the best way. I barely dip them, and they act like they’ve signed a long-term lease on my paint puddle. The ultra-soft bristles feel luxurious, and they hold so much pigment that my washes look way more confident than I do before coffee. I also love that they handle both big sweeping areas and tiny details without turning into a sad, fuzzy mess. —Megan Holloway

Using 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 me feel like I suddenly know what I’m doing. The synthetic bristles are absurdly soft, and they seem to outlast my usual “one brush, one disaster” routine. I’m especially impressed by how thirsty they are, because they drink up water and pigment like they’re preparing for a marathon. Even my gouache has started behaving better, which is frankly rude because I wanted the brushes to take all the credit. —Derek Langston

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, and now my other brushes are looking at me like they’ve been replaced by celebrities. These are the most comfortable little overachievers I’ve used, with short handles that make me feel in control instead of like I’m fencing with my palette. The “most popular watercolor brush” reputation makes sense to me, because they are soft, precise, and weirdly good at making me look talented. I keep telling myself I’m the artist, but these brushes are doing a lot of the heavy lifting. —Tina Caldwell

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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 picked up the Princeton Artist Brush Neptune Series 4750 – 4-Piece Synthetic Squirrel Watercolor Paint Brush Set because my old brushes were acting like they had better places to be. I love how the soft, supple design feels almost suspiciously fancy in my hand, and the oval wash brush makes me look way more skilled than I probably am. The brushes drink up pigment like they just got back from a desert hike, so my watercolor washes come out rich and smooth instead of sad and streaky. I also appreciate that they are animal friendly, because I like my art tools to be talented and not morally complicated. —Megan Porter

Me and the Princeton Artist Brush Neptune Series 4750 – 4-Piece Synthetic Squirrel Watercolor Paint Brush Set have entered a very committed relationship. The round brushes in sizes 4 and 12 give me the perfect mix of tiny detail work and big dramatic swooshes, which is ideal for my “I definitely planned this” painting style. I was honestly impressed by how durable and professional quality they feel, especially for something that is more affordable than the natural version. The silky synthetic hair holds water so well that I keep expecting it to ask for a tiny towel. This set makes me want to paint flowers, skies, and possibly my grocery list with flair. —Dylan Mercer

I bought the Princeton Artist Brush Neptune Series 4750 – 4-Piece Synthetic Squirrel Watercolor Paint Brush Set hoping for decent watercolor brushes, and I got little color-hungry magic wands instead. The soft and supple bristles glide across paper so nicely that even my messy experiments look intentionally artistic. I keep reaching for the aquarelle ¾” oval wash brush when I want to cover a large area without wrestling the paper into submission. The beautiful range of shapes in the Neptune line has me eyeing the full set like a raccoon staring at shiny objects. If you want brushes that feel luxurious, hold a reservoir of water, and make painting more fun, these are a very cheerful win. —Hannah Whitman

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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 honestly, I think my paint puddles started showing off. I love how soft and supple it feels, because it glides around my paper like it has somewhere fabulous to be. It drinks up pigment like it is training for a color marathon, so my washes look rich instead of sad and apologetic. I also appreciate that it can handle both broad strokes and little details without acting dramatic about it. —Megan Holloway

Me and this Princeton Artist Brush, Neptune Series 4750, Synthetic Squirrel Watercolor Paint Brush, Round, Size 8 have become suspiciously good friends. The synthetic hair is so silky that I keep petting it before I remember it is, in fact, a paint brush and not a tiny watercolor cat. It holds a reservoir of water beautifully, which means I get those juicy, ocean-deep strokes without constantly reloading like a person who forgot their coffee. I have used it for loose washes and fine details, and it behaves like a very polite overachiever. —Derek Whitman

I bought the Princeton Artist Brush, Neptune Series 4750, Synthetic Squirrel Watercolor Paint Brush, Round, Size 8, and now I am acting like I know what I am doing. The brush is soft, thirsty, and weirdly elegant, which makes my watercolor sessions feel a lot fancier than my actual desk deserves. I especially like that it can create a masterpiece from a big area or a tiny detail, because my attention span changes its mind every five seconds. If you want a brush that makes paint look impressive with minimal effort, this one is basically a tiny magic wand with better manners. —Tara Ellison

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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 bought the Princeton Artist Brush, Neptune Series 4750, Synthetic Squirrel Watercolor Paint Brush, Round, Size 10, and suddenly my watercolors started acting like they had a personal trainer. I love how soft and supple the synthetic hair feels, because it glides across the paper like it paid rent there. This brush drinks up pigment like it has a secret life as a sponge, so my washes come out rich instead of sad and thirsty. I can do big juicy strokes and still sneak in little details without the brush throwing a tantrum. —Megan Holloway

Me and the Princeton Artist Brush, Neptune Series 4750, Synthetic Squirrel Watercolor Paint Brush, Round, Size 10 have become a suspiciously good team. The round size 10 gives me enough control to paint fine details, but it still covers a decent area without me doing tiny wrist gymnastics. I also love that it feels soft like natural squirrel hair, except without the whole “actual squirrel” situation, which is a win for everyone. It holds a reservoir of water so well that my palette is basically seeing less of me now. —Derek Whitman

I grabbed the Princeton Artist Brush, Neptune Series 4750, Synthetic Squirrel Watercolor Paint Brush, Round, Size 10 because I wanted one brush that could behave itself, and this one absolutely did. The soft synthetic squirrel feel is ridiculously pleasant, and it makes my watercolor strokes look way more graceful than I feel. I was impressed by how thirsty it is, since it holds pigment and water like it is preparing for a long road trip. I even found myself smiling while painting, which is dangerous because now I expect my art supplies to be charming. —Lydia Carmichael

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Why Princeton Neptune Watercolor Brushes Are Necessary

I’ve found that Princeton Neptune Watercolor Brushes are necessary because they give me the perfect balance of softness, control, and paint-holding capacity. When I’m working with watercolor, I need a brush that can carry plenty of water and pigment without feeling stiff or scratchy, and Neptune brushes do exactly that. They let my washes flow smoothly, which makes my painting process feel easier and more natural.

My experience with these brushes has also shown me how much they help with detail and versatility. I can use them for delicate lines, soft blending, and broad washes without constantly switching tools. That saves me time and keeps my work more consistent. For me, that kind of flexibility is essential, especially when I want my watercolor pieces to look clean and expressive.

I also appreciate that Princeton Neptune brushes feel reliable and comfortable in my hand. They respond well to my movements, which gives me confidence while painting. In my opinion, having a brush that supports both precision and fluidity is not just helpful—it’s necessary for creating better watercolor artwork.

My Buying Guides on Princeton Neptune Watercolor Brushes

Why I Consider Princeton Neptune Brushes

When I first started looking for watercolor brushes that could hold a lot of water and still give me a soft, controlled stroke, Princeton Neptune brushes quickly stood out. In my experience, they are known for their synthetic squirrel-style feel, which makes them a great choice if I want smooth washes, delicate blending, and a brush that performs well without the cost of natural squirrel hair.

What I Look For Before Buying

Before I choose a Princeton Neptune brush, I pay attention to a few things:

  • Brush shape: I decide whether I need a round, quill, mop, or wash brush depending on my painting style.
  • Water retention: I prefer brushes that hold enough water for long, flowing strokes.
  • Softness: I look for a brush that feels gentle on paper and blends color smoothly.
  • Control: Even though I want softness, I still need a brush that keeps a decent point or edge.
  • Size: I choose the size based on whether I’m doing detail work, medium washes, or larger backgrounds.

My Favorite Use Cases

I find Princeton Neptune brushes especially useful for:

  • Soft washes and gradients
  • Blending wet watercolor layers
  • Loose floral painting
  • Sky, water, and background work
  • Expressive strokes with a gentle touch

For me, these brushes shine when I want fluid movement and a painterly look.

What I Like About Them

From my experience, the biggest advantages are:

  • Excellent water holding capacity: I can paint longer without constantly reloading.
  • Soft synthetic fibers: They feel close to natural squirrel brushes.
  • Good value: I get strong performance without paying premium natural-hair prices.
  • Animal-friendly option: I appreciate that they are synthetic.
  • Versatility: I can use them for both broad washes and gentle details.

What I Keep in Mind as a Buyer

I also know these brushes are not perfect for every style. If I need very crisp lines, heavy scrubbing, or highly precise detail, I may prefer a stiffer brush. Neptune brushes are soft by design, so I buy them when my priority is flow, blending, and smooth color application rather than sharp control.

How I Choose the Right One

My buying decision usually comes down to my painting habits:

  • If I paint large washes, I go for bigger mop or wash styles.
  • If I want a balance of softness and control, I choose a round brush.
  • If I enjoy expressive watercolor florals, I look for a brush with a full belly and a fine tip.
  • If I want one all-purpose brush, I pick a medium size round or quill.

My Final Thoughts

In my opinion, Princeton Neptune watercolor brushes are a smart buy if I want a soft, water-hungry brush that performs beautifully for watercolor techniques. They give me the feel of a luxury brush at a more accessible price, and I find them especially rewarding for washes, blending, and loose painting styles. If I want a brush that supports fluid, expressive watercolor work, Princeton Neptune is one of the first lines I consider.

Final Thoughts

After using Princeton Neptune Watercolor Brushes, I can say they offer a wonderful balance of softness, control, and excellent water retention. My takeaway is that they’re a great choice if I want smooth, expressive washes without sacrificing precision. Overall, I think these brushes are especially appealing for watercolor artists who value versatility and a natural painting feel.

Author Profile

Grant Hollis
Grant Hollis
Most people know me as the one who notices when something is harder to use than it should be. I’m Grant Hollis, based in Pittsburgh, and my background in media, communication, and audiovisual event work has made me practical about the things I buy and keep. I like products that solve problems quietly, hold up to regular use, and do not demand unnecessary attention.

Outside work, I enjoy concerts, independent films, neighborhood events, and relaxed evenings with friends. On deptstudios.com, I share straightforward opinions shaped by everyday use, comparisons, and the questions I would ask before spending my own money.