I have an old brick Cattle watering tank on my land. Dimensions 4x1x1m

It was previously patched with cement, which has now blown out. I plain to knock the cement off, and re-point  the bricks with lime mortar.

I’d like to use the tank as a dipping pool/garden-water storage tank, so I’m planning to seal the inside with natural Prompt cement.

Should I mix the Prompt with sand as well as water to form a good spreading render?

Any advice welcome.

Justine Changed status to publish May 25, 2021