Adding fiber to plaster will strengthen it considerably. Same principle as fiberglass. Old type plasterers used hair but probably paper fibers are easier to get/make and would give finer detail. Egg cartons are a good source. A old book quotes about 2% will double the impact strength and more is better.
The limit is really how much you can add to the water and still be able to mix with the plaster and mould with it, it gets difficult above a couple of %. |