I'm thinking of an easel with a way to screw into the back of the canvas so it hovers in place giving access to all sides.

Or maybe a reverse clamp that pushes against the inner edges of the back of the canvas that connects to an easel.

The problem is that when I paint the bottom of a canvas I need to wait for the top to dry and then flip it. Or I need to hang the canvas, but it isn't held solidly in place.

I'm experimenting with paints. I've found that Golden heavy body paints are thick and useful for texture.

But, liquitex soft body paints feel practically like ink in that I can easily draw lines using a liner brush.

Just adding water to the thick paint doesn't achieve the same thing. Is there some sort of material I can add to thick paint to achieve the same effect so I don't need to stock up on multiple types of every color?