Yes...there are commercially available natural plasters and they are very good. I have used a product for finish plasters from American Clay. What I love about them is that they are easy to mix...just add water...and they are available in a wide variety of colors...really really cool colors. Check out the company's website. I like to make my own finish plasters but find that American Clay plasters are superior to mine in every way. You don't have to fuss for hours to get the color right and they go on like butter. I always feel a bit guilty using a commercially available product, but what the heck, they work and they make a very fine finish plaster.
I have well over two hundred sources, suppliers, and vending artisan in all the different mediums of, earth, lime, and paper plasters. It is hard to really share all of these yet if you do searches in each of these venue we can discuss there viability for your given application.
Regards,
j
Here. Have a potato. I grew it in my armpit. And from my other armpit, this tiny ad:
montana community seeking 20 people who are gardeners or want to be gardeners