Quick answer: To use glaze in acrylic painting, mix a small amount of transparent paint into a glazing medium (start around 1 part paint to 5–10 parts medium), brush it in a thin, even layer over a completely dry area, and let it dry before adding the next glaze. Each glaze tints the colors beneath like stained glass, letting you deepen shadows, shift color temperature, unify a painting or build rich, luminous color in stages.
A glaze is a thin, transparent layer of color applied over dry paint. Rather than covering what is underneath, it changes it, the way a colored filter changes a photograph. Old master oil painters relied on glazing for depth and glow. With acrylic, the technique is faster, because each layer dries in minutes rather than days.
This guide explains how to use glaze in acrylic painting from start to finish: what to mix glazes with, which pigments work best, a step-by-step method, practical uses, and how to avoid streaks and cloudiness. Good glazing does not require expensive paint, and our guide to the best acrylic paints for artists on a budget includes affordable options with the transparent colors glazing relies on.
Glazing vs Washing vs Scumbling
These three terms are often mixed up. They are all thin layers, but they behave differently.
| Technique | What it is | Thinned with | Visual effect |
|---|---|---|---|
| Glaze | Thin, transparent layer over dry paint | Glazing medium (mostly) | Tints and deepens; underlayers fully visible |
| Wash | Very diluted paint, often on raw or toned surfaces | Water (mostly) | Soft, watercolor-like stain; less control |
| Scumble | Thin, semi-opaque, often lighter layer, scrubbed on | Medium or used fairly dry | Hazy, softening veil; lightens and cools |
In short: a glaze is transparent and usually darker or more saturated than what is below; a scumble is semi-opaque and usually lighter.
What to Mix Acrylic Glazes With
Glazing medium (recommended)
Acrylic glazing medium, gloss medium or fluid medium thins the paint while adding binder. That keeps the glaze film strong and flexible, helps it level smoothly, and preserves adhesion. Some glazing liquids also extend drying time slightly, which makes even application easier.
Water (with limits)
Water thins paint but also dilutes the binder. A little water is fine, but heavily water-thinned glazes can look patchy and may form a weak film, especially on non-absorbent surfaces. Many manufacturers suggest keeping water under roughly a third to half of the mix for regular acrylic.
Gloss vs matte medium
Gloss medium keeps glazes clear and jewel-like. Matte medium contains matting agents that can make several stacked glazes look cloudy or milky. If you want a matte finished painting, glaze with gloss medium and use a matte varnish at the end.
Glaze Mixing Ratios
| Glaze strength | Approximate ratio (paint : medium) | Use |
|---|---|---|
| Very subtle tint | 1 : 15–20 | Gentle temperature shifts, atmospheric haze |
| Light glaze | 1 : 10 | Unifying color, soft shadows |
| Medium glaze | 1 : 5 | Deepening shadows, intensifying color |
| Strong glaze | 1 : 2–3 | Dramatic color change; may lose transparency |
These are starting points. Pigment strength varies widely, so test on a scrap painted with similar colors. A strong, high-tinting pigment like phthalo blue needs far less paint than a weak earth color.
Best Pigments for Glazing
Transparent pigments make the clearest glazes. Opaque pigments can still be glazed in tiny amounts but tend to look chalky or foggy.
| Transparent (excellent for glazing) | Semi-transparent | Opaque (use sparingly) |
|---|---|---|
| Phthalo blue and phthalo green | Ultramarine blue | Titanium white |
| Quinacridone magenta, rose and gold | Burnt umber | Cadmium reds and yellows |
| Dioxazine purple | Hansa yellow | Cerulean blue |
| Transparent red oxide and transparent yellow oxide | Naphthol red | Yellow ochre |
| Burnt sienna (many brands) | Sap green (varies) | Chromium oxide green |
Many paint labels show a transparency rating or symbol. You can also test by painting a stripe over a black permanent marker line: transparent colors let the line show clearly; opaque colors cover it.
How to Use Glaze in Acrylic Painting: Step by Step
- Make sure the underlayer is completely dry. Glazing over damp paint lifts and muddies it. Thin layers are usually dry within 30 minutes; thicker paint needs longer.
- Mix the glaze. Put a pool of glazing medium on your palette and add a small amount of transparent paint. Mix thoroughly. Make more than you think you need so you do not run out mid-area.
- Test it. Brush a stroke on a scrap or the edge of your painting to check the strength.
- Choose the right brush. A soft, wide synthetic flat or a soft hake brush gives smooth glazes. Stiff bristle brushes leave streaks.
- Apply evenly. Brush the glaze in one direction, with light pressure and slightly overlapping strokes. Work quickly enough that edges do not dry before you blend them.
- Soften edges. To feather a glaze into surrounding areas, use a clean, dry soft brush or a lint-free cloth to blot the edge.
- Wipe back if needed. Remove glaze from highlights with a soft cloth while it is still wet to keep them bright.
- Let it dry completely. Most acrylic glazes dry in 15–30 minutes, depending on thickness and conditions.
- Repeat. Build depth with several thin glazes rather than one heavy one. Each layer adds richness.
Practical Uses for Acrylic Glazes
Deepening shadows
Instead of mixing black into shadow areas, which can make them dull, glaze a transparent dark like ultramarine plus burnt sienna, or a transparent violet, over the shadow. The result stays luminous because light passes through the glaze and reflects off the paint beneath.
Shifting color temperature
A thin glaze of warm transparent orange or quinacridone gold can warm up a sunlit area. A thin blue or violet glaze can cool and push back distant hills, creating atmospheric perspective.
Unifying a painting
When colors feel disconnected, a very thin glaze of one color over the whole painting can tie everything together, like the warm light of late afternoon.
Intensifying color
Glazing a pure transparent color over a similar opaque color makes it more saturated. For example, quinacridone rose over a pink can create a glowing, jewel-like red.
Glazing over a monochrome underpainting
Paint a full value study in grays or browns, then glaze transparent colors over it. Because the values are already established, glazes add color without disrupting form. This is a classic method for portraits and still lifes.
Correcting mistakes
If an area is too bright, too cool or too warm, a glaze can fix it without repainting. A thin complementary glaze neutralizes overly intense colors.
Why Glazes Look Different From Mixed Color
If you mix blue and yellow on the palette, you get a green. If you paint yellow, let it dry, and glaze transparent blue over it, you also get green, but it looks different: often brighter and deeper. That is because of how light travels through the layers.
With a physical mix, pigment particles of both colors sit side by side at the surface and reflect light together. With a glaze, light passes through the transparent top layer, bounces off the opaque layer beneath, and travels back out through the glaze again. That double journey through color filters creates an inner glow that a flat mix rarely matches. Painters call the result optical mixing, and it is the main reason glazing is worth the extra steps.
It also explains why glazing works best over lighter, brighter underlayers. A glaze can only darken or tint what is beneath it. If the underlayer is already dark and dull, there is little light for the glaze to work with.
A Simple Glazing Exercise
- On a small primed board, paint three squares: one white, one light yellow, one mid-gray. Let them dry.
- Mix a light glaze of a transparent blue with gloss medium, about 1 part paint to 10 parts medium.
- Brush one layer across all three squares. Let it dry.
- Glaze the lower half of each square a second time. Let it dry.
- Glaze the bottom quarter a third time.
You now have a chart showing how one glaze color reacts over different bases and how depth builds with each layer. Keep it as a reference.
Glazing Tips by Experience Level
Beginners
- Practice on a simple shape, like a sphere painted in grays, glazing color over it.
- Use a single transparent color at first to see how layering builds depth.
- Keep glazes thin; it is easier to add another layer than to remove one.
Intermediate
- Alternate glazes of different colors to create complex, optical mixes.
- Combine glazing with scumbling for both depth and atmosphere.
- Use a palette knife to drag glazes over textured areas so they collect in crevices.
Advanced
- Plan glazing sequences from the start, painting underlayers lighter and more saturated than the final goal.
- Use an isolation coat before final glazes so they can be adjusted or wiped back without disturbing earlier layers.
- Experiment with interference or iridescent glazes for shifting effects.
Troubleshooting Acrylic Glazes
| Problem | Cause | Fix |
|---|---|---|
| Streaky glaze | Stiff brush; glaze drying too fast; overbrushing | Use a soft brush, a glazing medium with longer open time, and fewer strokes |
| Cloudy or milky glaze | Matte medium; opaque pigment; too much white | Use gloss medium and transparent pigments |
| Underlayer lifting | Underlayer not fully dry; scrubbing | Wait longer; apply glazes with light pressure |
| Glaze too dark | Too much paint in the mix | Wipe back while wet; mix thinner next time |
| Hard edges where glaze ended | Edge dried before softening | Feather edges quickly with a dry brush or cloth |
| Beading or crawling glaze | Very glossy or greasy surface | Lightly sand or use a medium with better flow |
| Uneven sheen | Different amounts of medium across the painting | Finish with an isolation coat and varnish to unify sheen |
Varnishing a Glazed Painting
Glazed paintings often end up with uneven sheen, since some areas have many medium-rich layers and others have few. A clear isolation coat of gloss medium followed by a varnish in your chosen sheen evens this out. Let the final glazes cure for at least a few days first, longer if you used slow-drying medium, so moisture is not trapped beneath the varnish.
Glazing on a Budget
Glazing is economical by nature, since a tiny amount of paint colors a lot of medium. A few transparent colors and one bottle of gloss medium can last a long time. You do not need professional paint for good glazes, though choosing colors made from transparent pigments matters more than brand. Check pigment codes and transparency ratings when buying.
For starter palettes that include useful transparent colors without a big outlay, see our list of affordable acrylic paints with good pigment strength.
FAQs
What do you mix with acrylic paint to make a glaze?
Mix acrylic paint with an acrylic glazing medium, gloss medium or fluid medium. A small amount of water is fine, but relying mostly on medium keeps the glaze strong and even.
What is the ratio for acrylic glazing?
A common starting point is about 1 part paint to 5–10 parts medium. Use more medium for subtle effects and less for stronger color, and test first since pigment strength varies.
Can you glaze acrylic with just water?
You can, but heavily water-thinned paint may dry patchy and form a weak film. A glazing medium gives smoother, more durable glazes.
How long should acrylic dry between glazes?
Thin glazes are usually dry in 15–30 minutes. Wait until the surface no longer feels cool or tacky before adding the next layer.
Why does my acrylic glaze look cloudy?
Cloudiness usually comes from matte medium, opaque pigments, or too much white in the glaze. Use gloss medium with transparent pigments for clear glazes.
Can you glaze over acrylic with oil paint?
Yes, oil can go over fully dried acrylic, but acrylic should not go over oil. Many artists use acrylic underlayers and finish with oil glazes.
Final Thoughts
Glazing is one of the most powerful techniques in acrylic painting: thin, transparent layers over dry paint that deepen shadows, shift temperature, unify color and create glow. Use glazing medium, choose transparent pigments, keep layers thin and let each one dry.
You can start with inexpensive paint and a bottle of medium. Explore our picks for the best budget acrylics for layered, luminous painting to build a glazing palette without overspending.
