Before starting to paint on canvas, check whether it is a suitable ground for your painting. Priming with gesso creates a perfect base and texture for the painting. The surface is ready with the right absorbency for any application. Gesso adds a high level of tooth (rough texture) to the surface, gliding the paint smoothly.
How to check? Look at the label before purchasing. If you see something like 'Titanium Acrylic Gesso Primed', this means it is primed with gesso. If the title doesn't indicate anything, check with the supplier. Another way to check is if the canvas surface is a bright white
color, then it is primed, and you are ready to go!
Can I begin painting on unprimed canvas?
Yes, you can, but the surface will not be good ground and could suck up a lot of expensive paint. A canvas that is primed adds a tooth and is less absorbent.
It becomes easy to work on the primed surface as it lets you move your brush quickly. It gives you more time to combine the paint onto the surface until it dries. If the surface is untreated, then the paint dries fast and is hard to blend.
There is a stark difference when you paint on primed and unprimed canvas. The textured surface gives you the desired result when you blend or mix colors. The primed surface does make a lot of difference in the final result.
What is Gesso?
Gesso is a medium that artists use to prime a canvas. It combines white paint and binders, very much like white acrylic paint, just thinner. It dries hard, which makes the surface stiffer, giving the right absorbency for the paints. Due to a good base, there is almost no chance of the paint chipping off, and hence work can last for years.
Gesso prepares (or primes) the surface for painting, making it slightly textured, so canvas can rightly accept the paint. The surface gets strong color adherence and stability after gesso is applied.
Types of Gesso
Artist grade and Student grade
As the name suggests, the artist quality is higher, and hence the pigment is high. Student grade has less pigment and more filler. Artist grade has more pigment than student grade, which makes it thicker and more opaque. I suggest you use artist quality even if you are starting out. The difference shows in the end result.
Clear and Heavy Body
Gesso is commonly available in clear, white, gray, and black colors. Clear and White gesso is widely used. But if you wish to give your painting any colored ground, add any acrylic paint to make it more pigmented.
Heavy body gesso is used for structural shapes and peaks, similar to how gels or heavy body paints are used. It would be best if you experiment with different brands to find the one you like best.
Apply a primer to Primed Canvas?
Yes! In reality, some artists prefer a different smoothness or experiment with various texture surfaces on the canvas. So they bring a primed canvas and apply gesso again. You could also apply another color gesso!
Is there an alternative to Gesso?
Yes, there are few alternatives to gesso like acrylic mediums, clear gesso, matte gel. You can still paint directly on the raw canvas without priming it if you are painting with acrylics.
If you are painting with oil, it is necessary to prime the canvas to protect the canvas from the oil. Oil makes the raw canvas brittle with time and eventually falls apart.
Steps to Apply Primmer (Gesso)
1. Take Acrylic Gesso Primer
Stir the gesso bottle thoroughly in its container using a stirrer. Before taking out gesso, check the surface and decide how many coats you want to apply one or two.
2. Take some Gesso
Into a plastic cup, pour just enough gesso to complete the first coat. If unsure how much, take a small quantity for now. You can take more gesso is required. Gesso dries fast. Hence close the jar immediately after use.
3. Add water
If you are applying only one coat, do not dilute. Only if you are going for multiple coats, add water and dilute the gesso. Do not add more than 25% water for thinning. Stir well. The very first layer will penetrate the fibers of the canvas readily and will be easier to disperse.
4. Brush it on
Using a broad flat brush or a sponge brush (the bigger your surface, the bigger brush you will need), lay the gesso on the canvas, apply flat strokes, evenly dispersing the gesso from left to right, and back. Move the brush in one direction to completely cover the surface.
5. Allow it to dry
Let the gesso dry for few hours. Move the surface to a different place so that it doesn't stick to the newspaper underneath. Wash your brush immediately with soap and water, do not leave it unattended.
6. Sand the first coat
Sand gesso to create a beautiful smooth finish, apt for photo-realistic paintings, sand each layer with fine sandpaper. Try to do it outside or within a well-ventilated place as particles move anywhere!
7. Apply a second coat
Apply a second coat using undiluted gesso. Sometimes as you put out each brushstroke, lumps or lines of built-up gesso will collect at the edge of the brushstroke. Using a different dry brush, remove these traces to smooth them out. This coat should be perpendicular to the first coat.
8. Use Sandpaper if required
Again sand the surface to get the right tooth.
9. Clean the brush immediately
Wash the brush under running water. Then use a brush cleanser to get rid of gesso completely. It is worth cleaning the brush multiple times, even if you think it is clean!
Buy a primed Canvas if you do not want to prime it.
Ready-primed canvases are readily available in the marketplace. It is always a good option if you don’t want to prepare your own. They are available in roll or stretched light wood frames in different sizes.
Canvas-covered boards are a cheaper option compared to stretched canvases. They will find a variety of canvas surfaces like from very fine to coarse.
- You can add some paint color to gesso if you are planning to paint the canvas background anyways
- Hardboard, paper, wood panels can also be primed with gesso before painting with acrylics or oil
- Most important, wash your brush immediately with water and soap. If you don't wash them, they will be ruined forever!
- Store the leftover gesso mix in an airtight container, so that can be reused.