Make sure the roof is washed clean and allowed to dry. Fix any cracks using Berger Joint Putty or applying a coat of Liquiguard and fixing a mesh above. Any bare concrete patches, are to be primed with Berger Stabilising solution. Once all the preperation is done, apply two thick coats of Berger Liquiguard allowing minimum six hours between coats. Can be applied by roller or brush, which can then be washed in fresh water.