
Gouache is a versatile painting medium that combines the opacity of acrylics with the fluidity of watercolours. Its vibrant colours and ease of re-wetting make it ideal for plein air painting. Before heading outdoors to paint en plein air, it's important to prepare your dry gouache and assemble the right tools. This includes selecting suitable paper, such as hot or cold-pressed watercolour paper, and choosing the right brushes, such as synthetic flats and rounds for their durability. Artists should also consider their comfort and seek shade to prevent paint from drying too quickly. A spritzer bottle can help keep paint moist, and a separate container for water and paper towels is essential for cleaning brushes between colours. With these preparations, artists can confidently take their gouache outdoors to capture the beauty of nature.
| Characteristics | Values |
|---|---|
| Gouache type | Acryl(a) gouache or traditional gouache |
| Paper | Watercolour paper, cold-pressed paper, Strathmore Visual journal, or Aquabord |
| Brushes | Synthetic bristles, flats and rounds |
| Other tools | Watercolour pencil, spritzer bottle, storage palette, paper towels, plastic mixing tray, mirror |
| Paint properties | Opaque, water-soluble, matte finish, fast-drying |
| Paint consistency | Creamy, not watery |
| Paint application | Can be layered, use a delicate touch and allow paint to sit on the surface |
| Painting position | Comfortable position, sitting or standing |
| Lighting | Seek shade, use photos for reference |
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What You'll Learn

Choose the right paper for gouache painting
Gouache is a water-based paint similar to watercolour, with which it is sometimes paired. Gouache is more opaque than watercolour due to the amount of white added during the forming process. It can be painted light over dark and dark over light, dries quickly, and remains water-soluble after drying.
When choosing the right paper for gouache painting, it is important to consider the weight and texture of the paper. The paper should be at least 140 lb/300 gsm to prevent buckling when paint is applied. While thinner paper can be used for simple line work or small doodles, larger washes on thin paper will cause it to crinkle.
Watercolour paper is a popular choice for gouache painting because it is absorbent and holds paint well. Cold-pressed watercolour paper has a textured surface that can add interest to layered gouache work, while hot-pressed watercolour paper has a smooth surface that is better suited for detailed painting.
Bristol paper is another option for gouache painting, as it has a perfectly smooth surface that allows for painting fine details. However, some cheap gouache paints may adhere poorly to the surface of Bristol paper.
Ultimately, the choice of paper for gouache painting comes down to personal preference and the desired finish. It is worth experimenting with different types of paper to see which one works best for your style and technique.
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Use a spritzer bottle to keep paint moist and prevent fast drying
Gouache is a fast-drying, water-soluble medium that is ideal for plein air painting due to its portability and versatility. To prepare dry gouache for plein air painting and prevent your paint from drying too quickly, using a spritzer bottle to keep the paint moist is a highly recommended approach.
First, prepare your gouache paint by allowing it to dry slightly. Pour the gouache paint into a portable palette or container and let it sit for about a week. This will give it a slightly thicker consistency, similar to creamy watercolour paint, which is ideal for plein air painting.
Once your gouache paint has reached the desired consistency, set up your plein air painting workspace. Ensure you have all the necessary materials, including your spritzer bottle, which should be filled with clean water. Position yourself in a comfortable spot, preferably in the shade if it's a hot day, to avoid the sun causing your paint to dry too quickly.
Throughout your painting process, regularly spritz your palette or container of gouache paint with water from the spritzer bottle. This will help keep the paint moist and prevent it from drying out. The moisture will also help reactivate the paint, allowing you to easily blend and layer colours without disturbing the underlying layers.
Additionally, you can use the spritzer bottle to lightly mist your painting surface if you want to create a wet-on-wet effect or blend colours directly on the paper. This technique can add interesting textures and effects to your plein air painting.
By following these steps and using a spritzer bottle, you can effectively control the moisture of your gouache paint and prevent it from drying too fast while painting outdoors. This technique will allow you to take advantage of gouache's unique properties and create vibrant and expressive plein air paintings.
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Use a small water-colour pencil for a light sketch before painting
When preparing dry gouache for plein air painting, it is essential to have a basic understanding of the materials and techniques involved. Plein air painting, or painting outdoors, offers a unique opportunity to capture the beauty of nature and explore the true colours and relationships of the surrounding environment.
Before diving into the specific technique of using a watercolour pencil for a light sketch, it is worth noting that gouache is a versatile medium that combines the opacity of acrylics with the fluidity of watercolours. This allows artists to create vibrant colours that can be easily re-wetted and corrected if mistakes are made.
Now, let's turn our attention to the watercolour pencil technique. Using a small watercolour pencil for a light sketch before painting can be a helpful guide for your gouache plein air painting process. This technique involves starting with a light pencil sketch, using a watercolour pencil, to outline the composition and place the key elements. It is important to sketch lightly to avoid scratching the paper, and a harder pencil lead can help with this. Harder leads produce lighter lines and are less likely to show through transparent washes. Additionally, using a neutral or pale colour that complements the overall tone of your painting can be beneficial. For example, a light blue for a waterscape or a pale grey for most subjects.
After completing the light sketch with your watercolour pencil, you can then use a kneaded eraser to lighten any areas that may be too dark. Once you are satisfied with your sketch, you can begin adding gouache paint. As gouache can be layered similarly to watercolour, you can carefully apply paint to your sketch, allowing it to dry before adding additional layers. Remember to pay attention to the unique challenges of painting outdoors, such as rapidly changing light and the need to keep your paints moist and workable.
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Use two whites with gouache
Gouache is a water-based paint similar to watercolour but with the added benefit of opacity. When preparing dry gouache for plein air painting, it is recommended to use two types of white gouache: zinc white and titanium white. Zinc white is warmer in tone and more translucent, while titanium white is cooler and more opaque. The use of two whites allows for greater flexibility in mixing colours and creating different textures and effects.
When mixing colours with white gouache, it is important to consider the consistency and texture of the paint. White gouache can be used to lighten and tint colours without affecting their opacity, which is ideal for creating highlights and cover-ups. For example, mixing Prussian blue with white gouache can create a sky with a marbled effect. Adding white gouache to a foliage green mixture can help achieve the desired value and saturation.
It is worth noting that different brands of white gouache may vary in consistency, texture, and ease of application. Some popular brands of white gouache include M. Graham Gouache Titanium White, Lukas Gouache Extra Fine Opaque White, and Winsor Newton Designers Gouache Zinc White. It is advisable to experiment with different brands and compare their swatches to find the ones that best suit your painting style and needs.
Additionally, white gouache can be mixed with watercolour to create unique effects. Watercolour and gouache blend easily due to their similar ingredients. Mixing white gouache with watercolour can result in a different texture compared to simply thinning the watercolour with water. This technique allows for the creation of opaque paint layers while maintaining the tint of the watercolour.
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Clean brushes with paper towels
When preparing dry gouache for plein air painting, it is important to keep your brushes clean to ensure the best results. Here is a step-by-step guide on how to clean your brushes with paper towels:
Step 1: Remove Excess Paint
Use a paper towel or painting rag to remove as much paint as possible from the brush. The more paint you can remove at this stage, the easier and faster the subsequent cleaning steps will be.
Step 2: Use a Solvent
Depending on the type of paint, select an appropriate solvent. For water-based paints, use water; for oil-based paints, use mineral spirits or paint thinner; for shellacs, use denatured alcohol; and for varnishes, use mineral spirits. Dip the brush into the solvent, ensuring that all paint-covered areas are submerged. You can also run the brush under water to rinse away any paint residue.
Step 3: Blot with Paper Towels
After rinsing or cleaning the brush with a solvent, use a paper towel to blot and remove any remaining moisture or solvent from the brush. Gently squeeze the bristles to facilitate the removal of any excess liquid.
Step 4: Repeat as Needed
If there is still paint residue on the brush, repeat the process by dipping the brush into the solvent again and then blotting with a fresh paper towel. Ensure you use a new paper towel each time to avoid redepositing paint onto the brush.
Step 5: Reshape and Dry
Once you are satisfied that the brush is clean, reshape the bristles and allow the brush to dry completely before storing it. Properly cleaning and drying your brushes will help extend their lifespan and ensure they are in good condition for future plein air painting sessions.
By following these steps and paying attention to the specific needs of your brushes, you can effectively clean your tools and create beautiful plein air paintings with dry gouache.
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Frequently asked questions
Gouache is a fast-drying medium, so it's important to set up your workspace efficiently. Here are some tips:
- Find a comfortable position, whether sitting or standing, to avoid distractions while painting.
- Seek shade on hot days to prevent your paints from drying too quickly.
- Use a spritzer bottle to keep your paint moist and workable.
- Have a container for water and another for paper towels. Change the paper towels once they're soaking wet to avoid taking too much water to your mixing tray.
- Use a plastic mixing tray on top of paper that matches the colour of your painting surface to remove the guesswork from mixing colours.
Gouache requires very few materials. You will need a soft brush, a sketchbook or watercolour paper, and a container for water. You may also want to bring paper towels, a spritzer bottle, and a plastic mixing tray.
Gouache can be layered similarly to watercolour but with a twist. Once a layer is dry, be careful when applying additional paint as it can reactivate the underlying layers. For fine details, thin the paint with water and use a fine brush. You can also use gouache transparently by thinning it with water to produce stained-glass-like effects.











































