Beckett Waterfall Foam Sealant - color?
 

I saw the Beckett Waterfall Foam Sealant at HomeDepot. Does anyone know the
following?
- what color is the foam?
- Is it easy to apply the foam between the steps in the waterfall?
- Is the foam visible? Does it look awkward between the stones and concrete
along the waterfall?

Any experience is appreciated.

Thansks.