Coarse stuff

A lime-sand mortar, known as coarse stuff , is generally prepared first. It may be produced by ... 

The workability of coarse stuff prepared in this way is improved by allowing it to stand overnight before use. Alternatively, coarse stuff may be purchased ready prepared. 

While coarse stuff does not need to be used immediately, it should be protected from drying out. Immediately before use, it should be gauged with the specified proportion of cement, adding sufficient water to obtain the required consistence. 

Mixes consisting of lime, Portland cement and sand, whether for undercoats or finishing coats, should be prepared as described in section 26.6.5. When hair is to be incorporated, it should be well beaten into and mixed with the coarse stuff before gauging with cement. 

---