After many weeks of painstaking research I have came across the recipe for
Petrified Hessian as use here in Australia since the war and still used
today, so I will print it here and appreciate any feedback, especially
from anyone that tries it. I live in a very wet environment and will post
feedback as to how it goes here.
Wayne
Petrified Hessian
5 liters water
5.5kg cement
900g lime
450g salt
225g alum
Apply the mix immediately to the hessian with a stiff brush, first outside
then inside. After the initial wetness goes but before the mix sets apply
a second coat to the outside. When this final coat sets the material will
be hard and strong. The mix should cover about 8m square. Keep the
surface damp for 3 days by spraying it with water.
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