Painting tote bags

I’m making these little white tote bags, painted with acrylics mixed with a fabric medium.

For now, I’ve noticed that mixing one part paint with another of medium makes the resulting substance long lasting but not¬†necessarily nice to use with stencils. And the final painting result is just cleaner if I do it by hand. But it shouldn’t be like that, right? Is my paint too thick or too runny?

Mm… must investigate that.