For anyone who collects or appreciates art, understanding how a painting is made can change the way you see it. An oil painting is not produced in a single sitting. It is built in stages, each one dependent on the last. The process involves careful preparation, deliberate layering, and patience — sometimes spanning weeks or months from the first brushstroke to the final coat. Here is a step-by-step breakdown of how artists create oil paintings from start to finish.

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Step 1: Preparing the Surface

Before any paint is applied, the surface must be prepared. Most artists work on canvas (cotton or linen) or a rigid panel. Raw canvas cannot receive oil paint directly — the oil will seep into the fibers and cause the material to rot over time (1, 2).

To prevent this, artists apply a primer called gesso. Traditionally made from chalk and glue, modern gesso is typically an acrylic polymer formulation that dries fast, is non-toxic, and works on both canvas and panel (3). The gesso seals the surface, controls how much paint it absorbs, and gives the material "tooth" — a slightly rough texture that allows paint to grip and adhere (4). Artists typically apply two to three thin coats, sanding lightly between layers to achieve a uniform surface. The number of coats also determines the final texture: fewer coats leave a rougher surface; more coats produce a smoother one suited to detailed, realistic work (5). Without this step, colors can appear dull, and the painting's longevity is compromised.

Step 2: Building and Layering Oil Paintings

Once the surface is ready, the artist begins laying in the painting, a painstaking process that unfolds in multiple layers.

The first layer is called the underpainting. This is a thin, monochromatic pass — often in raw umber or burnt umber — used to map out the composition, establish value relationships (the range from dark to light), and lock in the basic structure of the image before color is introduced (6). It serves as a blueprint. Because it is painted thinly and with solvent rather than oil, it dries within 24 to 48 hours, making it ready for the next stage quickly (7).

After the underpainting is dry, the artist builds up color in subsequent layers, following what is called the "fat over lean" rule: each new layer must contain more oil than the one beneath it. If this rule is reversed, the top layers dry faster than those below, causing cracking as the paint film contracts at different rates (8). This principle is fundamental to the structural integrity of any multi-session oil painting.

As the painting develops, artists may use glazing — applying thin, transparent layers of paint mixed with a medium over a fully dried layer below. Glazing shifts color temperature, deepens shadows, and creates a luminous depth that cannot be achieved by mixing paint directly on the palette (9). The upper and lower layers mix optically rather than physically, producing a rich, "stained-glass" effect long used by painters from Vermeer to the present day (10).

Step 3: Finishing and Varnishing

Once all paint layers are complete, the work is not truly finished. Oil paint does not dry by evaporation the way watercolor or acrylic does. It cures through oxidation and polymerization — a chemical process that continues well below the surface for months, sometimes years, after the top feels dry to the touch (11).

For this reason, most professional painters and conservators recommend waiting six to twelve months before applying a final varnish (12). Varnishing too early can trap solvents and interfere with the curing process. While waiting, artists may apply a temporary retouch varnish, which restores gloss and color vibrancy to areas that have become dull without sealing the paint film permanently (13).

The final varnish, available in a gloss, satin, or matte finish, serves two functions: protective and aesthetic. It shields the paint surface from dust, dirt, and environmental damage, and it unifies the painting's surface, bringing areas of varying sheen into a consistent finish (14). Historically, this is why the oil paintings you see in museums have that characteristic unified surface quality; the varnish is doing visible work. For collectors, a properly varnished painting is also easier to clean and maintain over time, and a removable varnish allows conservators to clean the surface without touching the paint below (15).

Conclusion

Creating an oil painting is a structured process that demands as much technical knowledge as artistic skill. From gessoing the canvas, to building the composition through layered underpaintings and glazes, to waiting out the long cure before applying a final varnish — each step has a direct effect on both the appearance and the lifespan of the finished work. For collectors and art lovers, knowing this process adds a layer of context to what you are looking at. The time and craftsmanship embedded in a well-made oil painting are not always visible, but they are always present.

Citations

1. Canvas ETC, "Priming Artist Canvas: Gesso, Oil Primer & Sizing Guide." https://www.canvasetc.com/priming-artist-canvas/
2. Fine Art Tutorials, "How to Prepare a Surface for Oil Painting." https://finearttutorials.com/guide/how-to-prepare-a-surface-for-oil-painting/
3. Russell Collection, "A Step-by-Step Oil Painting Process for Beginners." https://russell-collection.com/oil-painting-process/
4. Princeton Brush Company, "How to Prep a Canvas Before Acrylic or Oil Painting." https://princetonbrush.com/blog/how-to-prep-a-canvas-before-acrylic-or-oil-painting/
5. Artists Network, "Beginner Oil: How to Prepare a Canvas for an Oil Painting." https://www.artistsnetwork.com/art-techniques/beginner-artist/beginner-oil-how-to-prepare-a-canvas-for-an-oil-painting/
6. Jackson's Art Blog, "Underpainting in Oil and Acrylic." https://www.jacksonsart.com/blog/2023/05/14/underpainting-in-oil-and-acrylic/
7. Russell Collection, "A Step-by-Step Oil Painting Process for Beginners." https://russell-collection.com/oil-painting-process/
8. Russell Collection, "A Step-by-Step Oil Painting Process for Beginners." https://russell-collection.com/oil-painting-process/
9. Russell Collection, "A Step-by-Step Oil Painting Process for Beginners." https://russell-collection.com/oil-painting-process/
10. Essential Vermeer, "Vermeer's Painting Technique: Glazing." https://www.essentialvermeer.com/technique/technique_glazing.html
11. Quora, "Do artists actually wait 6–12 months before varnishing oil paintings?" https://www.quora.com/Do-artists-actually-wait-6-12months-before-varnishing-oil-paintings-and-sell-them-What-if-its-commisioned-art
12. Quora, "Do artists actually wait 6–12 months before varnishing oil paintings?" https://www.quora.com/Do-artists-actually-wait-6-12months-before-varnishing-oil-paintings-and-sell-them-What-if-its-commisioned-art
13. Will Kemp Art School, "How to Varnish an Oil Painting? 7 Questions for Every Artist." https://willkempartschool.com/how-to-varnish-an-oil-painting/
14. Natural Pigments, "All You Need to Know About Varnishing Paintings." https://www.naturalpigments.com/mediums-grounds/varnishes.html
15. Milan Art Institute, "Artist Pro Tips | 8 Techniques for How to Varnish a Painting." https://www.milanartinstitute.com/blog/worried-about-ruining-your-painting-how-to-varnish-oil-acrylic-art-the-right-way