Available options:
(1). Go for a light colored canvas so that you can use it for the finishing touch. You can also go entirely blank or have the canvas re-make itself, depending on how you want to be able to see everything you do..
(2). Alternatively, you can use a thin piece of cardboard instead for a quick and inexpensive project. Paint your desired canvas, then let the paint dry..
(3). Avoid any finish or varnish, as it will cause a canvas to crack. Watercolors are best for this project because they won't affect the final product..
(4). Make sure that the canvas is strong enough to withstand extended exposure. You will need at least 2 feet in length to wrap..Choose from options above and answer: What most naturally follows?

How to make bottle cap art
Choose your canvas.
You can use a regular thin canvas, or a thick wrapped canvas. A plank of wood from the craft store will also work.
Answer:
(2).