Dyebrick can be used to restore and enhance old faded concrete and clay roof tiles. It is only suitable for uncoated, natural concrete and clay roof tiles and should not be used on modified acrylic slurry-coated tiles or tiles with a glazed or sealed surface. Quite a few tiles manufactured over the last 10 years fall into this category, so please check first. The Dyebrick Lifetime Guarantee does not apply to roof tiles. However, we do supply a 5 Year Guarantee against colour loss or fade. Vertical clad tiles are covered by a Lifetime Guarantee. The best method for application is by paintbrush but can also be spray applied. Dyebrick will not be effective on moss, algae or lichen or excessive dirt, so these deposits must be removed by pressure washing. Allow the cleaned areas to dry out thoroughly as the roof needs to be dry prior to any tinting work. Concrete roof tiles can absorb a lot of fluid so please test the coverage rate of your tiles first. See how many tiles you can coat using 1 litre of water first, this will give you a guide on how much to purchase.[b]