We have a 2 1/2 year old house. The exterior concrete was poured at two different times (September & November). As a result the front step area (8' x 15') is a light coloured concrete and the front of the garage (8' x 30') is a much darker colour. We are worried that when we asphalt our driveway we will end up with three different colours for the front of the house. Is there anything out there that we can put on the existing concrete (that will not flake our require yearly reapplications and can withstand Canadian winters) that will give us a uniform colour?