Prepping the canvas
With a foam brush paint the canvas several different colors. Put small swatches of color all over the canvas randomly. There is no pattern and you don’t even have to clean your brush in between colors. Just make sure the whole canvas is covered. Let the canvas dry overnight.
Be careful that there are no ridges of paint. If you take a dry brush and brush over the canvas after you are done painting it this will smooth out any ridges. When dry it should look like this Halloween one. I forgot to take a picture of the pastel one before I finished it.