Covering concrete steps making them look like marble

[Sylvia]

Hi
My name is Sylvia from Australia have been watching your show, and would really like to know what the powder is that was used to cover front steps of a home and then scored and coloured to look like it was marble then sealed
Written on the buckets in the show was Durock it was a white powder substance.

[Heather]

Living in nova scotia and wanting to put tile outside on my front concrete steps. Ideas re- type of tiles to use and product to glue tiles and gout to withstand weather.