Step 1.5. Slurry
A skim coat of slurry
Slurry is a paste-like mixture of cement and water with maybe a little bit of fine sand if you want to add a bit of substance.
As mentioned on the previous page, I kept the hypertufa moist and covered with polythene for ten days (the curing period).
On day 4 of the curing period we added a skim coat of slurry.
Because the hypertufa was going through the curing period, it would adhere well to the slurry.
First Angela gave the hypertufa a bit of a brush to get rid if any loose stuff.
Then she mixed 3/4 bucket of cement, 1/4 bucket of fine sand, and added water as needed to a paste-like consistency.
And then she poured it onto the hypertufa.
She then spread the slurry about with a gloved hand and smoothed it off with a trowel.
The hypertufa had a roughish type texture and the slurry was like the icing on the cake.
The slurry was just thick enough to cover the rough texture of the hypertufa.
Once the slurry had been smoothed, we ensured that it stayed moist while we waited about three hours for it to firm enough to allow the sheet of polythene (plastic) to go back on.
Of course, firming times could vary greatly depending on climatic conditions.