Painting Big

Take a 6'x12' foot canvas and prop it up outside. Know and feel what energy, mood, emotion, message you want to express. It can be something painful. Realize you will leave a lot up to timing, accident and chance. It's ok to think it's not going to work out. Begin with a pencil composition of the painting; it can be crude. A circle will do. Then go in with spray paint and add unrefined details. Focus on an aspect such as the eyes if you happen to be painting a head. Next, go in with a roller and cover large areas with acrylic house paint. Think about the basic graphic qualities of the image. Then come back with a spray bottle filled with acrylic paint. Have a squeegee handy. Now engage in a process of applying paint and scraping and washing out areas. Wait for the image to provoke and get attention.
"It's as much about waiting as creating," said Sacramento artist Gale Hart.
The process above is a loose description of what Gale had to say about working on a huge canvas. She said it's hard for her to take credit for the paintings because she leaves a lot up to accident and chance. "I can take credit for knowing when to start and when to stop," she said.

http://www.rexart.com/stretching.html