Light grey & Dark grey fiber cement board used for Dining table and Coffee table

Beautiful and smooth fiber cement board can be used for dining table and coffee table top.
Size is below:
Dimension: 1220x2440mm or 1200x240mm
Thickness: 5-25mm

How to treat the fiber cement board surface?
- Fine Sanding
- Painting

About the density, there is any demand?
- High density: 1.4-1.6g/cm3

Does the fiber cement board is waterproof?
- For using table, it must be waterproofing.