Follow these steps in preparing your canvas or priming the canvas with a prepared priming product.
You will need Modeling Paste and Gesso.
You will need to mix:
50% modeling paste
Why do we need to prime the canvas again rather than using an already primed canvas straight away is this. These canvas’s are way too rough, even though they are primed once or twice already.
This additional canvas preparation gives you the smooth texture, (similar to an egg shell finish) that helps throughout your entire process of painting in this technique.
It will help with your pencil and ink drawings, all the way through and in the final layer, where very small minute brush strokes are used.
Why Modeling Paste? The modeling paste gives the gesso body. It is an acrylic product.
Acrylic products have proven themselves to be long lasting and not detrimental to the oil paint film. They should only be used in this canvas preparation or priming and subsequent toning of the canvas. (discussed in the next painting lesson)
Never put acrylic over oils.
With the gesso having the additional body, it is easier to spread and smooth out. It also is easier to remove imperfections. Using straight gesso, (which usually contains a marble dust and becomes very hard, like sanding rock!) makes it very, very difficult to sand and/or smooth out.
Your tools needed are as follows: (links take you to DickBlick art supplies store)
First off, besides gesso
And the modeling paste mentioned earlier.
A single edged razor blade with its corners ground off off by grinding.
If you don't grind, the razor will gouge out deep cuts in the gesso/modeling paste layer.
The rounded razor removes only the high spots!
If you can't grind a razor down, just use sand paper.
It will take longer, but you will get satisfactory results.
About 120 grit should do it. Anything larger (80 grit) leaves gouges, any thing finer, (400 to 800) will take you forever, but judge by how much material is removed. You just want the high spots gone.
Here you can see I have worked one side (edge) and have rotated
the canvas to start the next side. Using a hair dryer, I blow dry the canvas to speed up the time to complete.
Once the layer is dry, you are now ready to smooth out this 1st coat. It takes 2 steps. The first is with the razor concentrating on the high spots or ridges created by the knife. (These will appear as fine lines unless you hold the canvas vertical against a light to see the actual risen edge). The second step is to sand the minor imperfections left over.
Remember, the egg shell smoothness is your goal.
Use strokes holding the razor at 90 degrees, (straight up and down) against the canvas. It is a scrapping motion, not a shaving motion you are going for. You should have very fine peelings of gesso/modeling paste coming off as you perform this. It is created from the high spots being scrapped off the surface.
Finishing up with some sandpaper to get the smoothest finish always helps shorten the process. I use about a 120 grit paper.
Holding the canvas against a light vertically will amplify your view of the surface imperfections. Repeat this process 2 more times, 3 if necessary, to get your egg shell finish for the perfect canvas preparation!
When you've done those extra coats, place the canvas vertical and close to a light source. You are looking for any raised edges. These need to be feathered out with the razor or the sand paper. Normally at this stage (3rd coat) the canvas is absolutely white, and smooth!
But before you click away, I've received emails of folks having problems stretching their factory prepared canvas's, so let me explain a little deeper. It is a problem with canvas's that I see where I buy in bulk, so this I think will help you. It's an expanded version and a video on how to prepare the canvas. So click below and get some more insight!
Back to the top of Canvas Preparation
Do you need a bit more examples or need to see the process from start to finish. My e-book "A Real Art Lesson" has a chapter just on this with over 2 dozen photos and a more detailed explanation on the use of the razor, sand paper, and confectionery knife.