This is what we want to end up with. The prep steps are to build a square with some 2x2 strips of pine and wrap your canvas, securing with staples.
To build your frames you will need to measure about 3/4" beyond the width of the canvas to create a nice buffer space, as show below. Measure. Miter and assemble your frame.
You will want a good sturdy material for backing, I chose Masonite, but any type of fiberboard will be fine.
Attach the backing board to your frame.
I chose a Satin Black. I like the outdoor furniture paint because its coverage and hiding qualities are great. Spray a few inches inside the backer because it will be visible from the front.