I created what I think is a novel painting technique that I have now made significant iterative improvement on over the last 4 or so years. I now have a large portfolio of medium-large scale paintings using this technique.
https://www.instagram.com/kemendoart/
The technique is a variation of a "fresco" which is applying watercolor to fresh plaster. This is a very old method that tends to survive long periods because it is making a material/mineral change in the composite medium in a way that embeds pigments into plaster - making it durable to degradation in ways that other methods aren't.
I take this further by blending the pigment into water and then adding lime plaster so that the plaster itself is pigmented, and then you work with the pigmented plaster much like you would work with oil on canvas. I make my own wooden frame "canvases" by hand and have had to deal with warping and cracking.
The challenges are numerous and there's nobody to follow or ask for help or advice because as far as I'm aware nobody has developed a practice for this. In many cases I've had to make my own pigment (For example I ground up Kingsford Charcoal for black pigment on "Untitled 7" which gave it more of a concrete texture)
The biggest challenge however is with pigments - not only are they hard to make and expensive to buy - but when mixing with lime plaster they get IMMEDIATELY washed out so that bright and bold colors are extremely hard to make.
I am currently working on my latest piece and this thread made me upload my latest progress to show: https://www.instagram.com/p/CvptIU1urzD/
In order to get the depth of pigment I want I am experimenting with soaking my unset plaster with tons of pigmented water. So far it's working!
My next set of experiments is to figure out a new frame material that will not decompose faster than the plaster. My fear is that in a 100 years the wood will have degraded and that will cause the whole thing to fall apart, so I need to figure out how to get the plaster to adhere to stone somehow.