How do you Prepare a Canvas for Watercolor?

The most important thing to do is prime a watercolor canvas. When you use watercolors, the paint will absorb into your canvas. In that case, it can be challenging for different colors to layer without mixing on the surface of your work. It’s helpful if you take some time beforehand and create a barrier between each color to stay separate when applied later on.

Further Details: https://www.theworkbuzz.com/can-you-use-watercolor-on-canvas/