Research on Concrete

Concrete is a long withstanding material which lasts more than 60 years without any issues and brick is a substance which lasts over 100.

Looking at thickness of concrete -

Concrete can be poured quite thin which could work well with our sign ideas. 

Concrete coloured - 

There is a company in New Zealand which specialises in coloured concrete.

This coloured concrete range is said to come at a premium cost as it is a new product but it is something which if could be poured into the sign shapes for us would be something which would last for generations. This would be difficult to pour and shape tho.

Reinforcement?

If the concrete is really thin then will enforcement fit?