Well in that case you better go get some plaster repair at a box store. Next go out to your grandpa's/uncle's farm and start brushing out every horse and jackass you can find. As you collect the horse/ass hair be sure to keep it free of dirt.

When you get home tomorrow add approximately 2 cups of horse hair to every bag of plaster for the "authentic" 1906 traditional plaster. Smoooth out the best you can, followed by a minimum of 6 or seven layers of paint over the following week.

Should blend well