Mastering Impasto: How to Paint Thick Like Van Gogh

How do I paint thick like Van Gogh? That's the question that brought you here, and it's the one I'm going to answer. Not with vague theory, but with a walkthrough of an actual painting session. Imagine you're a hobbyist who's been painting for a year, mostly in acrylic, and you want to try your hand at oil impasto—the technique of laying paint on so thick that the brush or palette knife marks stay visible (Tate). You've seen The Starry Night and felt its energy, and you want some of that in your own work. Let's get you there.

Why Impasto Works: The Physics of Thick Paint

First, understand what you're dealing with. Oil paint doesn't dry by evaporation—it cures by absorbing oxygen in a chemical reaction that cross-links the oil into a solid film (EPFL GraphSearch). That's why a thick impasto stroke can stay workable for days. It's also why you can't rush it. Van Gogh painted The Starry Night in June 1889, during his stay at the asylum in Saint-Rémy (Wikipedia). He built his surfaces with rapid, vigorous strokes, often straight from the tube. That's the look you're after. But here's the thing: you can't just slap on any paint thickly and hope it holds. You need the right consistency and the right approach. Let me save you some grief.

Step 1: Choose Your Weapon—Palette Knife vs. Brush

For impasto, I recommend a palette knife for most of the heavy lifting. It gives you clean, sculptural swaths of paint. But don't dismiss brushes—Van Gogh used them, and they carry a different energy. If you're going for the swirling sky effect, a stiff hog-hair brush will do it. For your first attempt, start with a palette knife. It's more forgiving. Load it with a generous blob of paint, lay it on the canvas, and pull it across. You'll feel the resistance. That's the paint speaking to you.

Step 2: The 'Fat Over Lean' Rule—Not Just a Suggestion

Here's where most beginners mess up. You can't just paint thick over thin willy-nilly. The golden rule of oil painting is 'fat over lean, thick over thin, slow-drying over fast-drying' (Winsor & Newton). Each new layer should be more flexible than the one below. Why? Because as oil paint dries, it flexes. If you put a stiff, lean layer over a fat, flexible one, the top layer cracks. So, in your impasto painting, you want to build from lean to fat. Start with an underpainting using fast-drying colors, then add thicker, slower-drying layers on top. For impasto, that means you'll want to mix a little extra oil into your final layers—just enough to make them buttery. But beware: too much oil can make the paint sag or take forever to dry. Moderation is key.

Step 3: Glazing to Add Luminosity—The Secret to Depth

Impasto is about texture, but it can look flat if you don't add depth. That's where glazing comes in. A glaze is a thin, transparent layer made of lots of medium and little pigment, painted over a fully dry layer (Glaze, Wikipedia). It lets light pass through and reflect back, giving your painting a luminous glow. Here's a concrete scenario: You've laid down a thick impasto of a sunset sky. Once it's dry—and I mean dry, not just touch-dry—you can glaze a thin, transparent orange over the top. The glaze settles into the crevices, and the highlights catch the light. The effect is magical. But remember, glazes are for dried paint. If you glaze over wet impasto, you'll just muddy it.

Step 4: Don't Forget the Drying Time—Patience is a Virtue

Now, the warning: thick paint takes a long time to dry. Oil paint dries slowly, over one to three weeks or more, depending on thickness and pigment (EBSCO/Study Rocket). That's not a bug; it's a feature. It gives you time to work and rework. But it also means you can't rush to glaze or varnish. I've seen beginners try to glaze a thick painting the next day, and it's a disaster. So, plan your sessions. Do the impasto in one sitting, then wait. In the meantime, work on another painting. That's what Monet did when he painted en plein air—he carried multiple canvases to capture changing light (Plein-air painting, Britannica). You can do the same: start two or three impasto pieces, rotate, and you'll never be stuck waiting.

Quick tip: If you're using acrylics, you can get impasto with heavy body paints, but they dry in minutes, so you can't work them as long. If you want the slow, malleable impasto of Van Gogh, go oil.

Step 5: The Final Touch—Embrace the Imperfections

Impasto is not about perfection. It's about capturing energy and emotion. Van Gogh's paintings are full of visible strokes, and they're celebrated for that. So, don't try to smooth everything out. Let the paint do what it wants. Stand back, look at the texture, and let it speak. When you're done, you'll have a painting that's not just an image, but a physical object with its own presence. That's what impasto gives you.

The single most important thing to remember: impasto is a dance between thickness and control. Respect the fat-over-lean rule, wait for drying, and don't be afraid to let the paint show. That's how you'll paint thick like Van Gogh.

Sources

• EBSCO / Study Rocket (Painting) - https://www.ebsco.com/research-starters/history/painting
• Drying oil (EPFL GraphSearch) - https://graphsearch.epfl.ch/en/concept/752713
• Impasto (Tate Art Terms) - https://www.tate.org.uk/art/art-terms/i/impasto
• Glaze (Wikipedia) - https://en.wikipedia.org/wiki/Glaze_(painting_technique)
• Oil painting rules (Winsor & Newton) - https://eu.winsornewton.com/en-row/blogs/guides/three-oil-painting-rules
• Plein-air painting (Britannica) - https://www.britannica.com/art/plein-air-painting