Bryant RedHawk wrote:It sounds to me like it was a lime putty that you describe.
Lime putty can be made with hydrated lime, salt will act as a hardener. The recipe is simple, water, lime, sand, salt if desired. Mix the lime and water till you get a "loose batter" consistency then add sand to thicken, or you can simply use the lime putty with out any sand.
The salt would be added after you have the consistency you desire for spreading with a stucco knife, it doesn't take a lot of salt should you want to use it.
I never mix this stuff by measuring I put 2-3 gal of water in my wheelbarrow then start stirring in lime from the bag, when I start getting trails from the wood paddle I use I add sand until I can just see grit in the mix.
If I'm not able to spread it right then, I add water until the putty is covered, it will store like that for weeks if necessary.
Phil Stevens wrote:If you want the coating to breathe and not trap water vapour in the straw then I would avoid portland cement.