Developed in Sweden over 15 years ago, SiOO is a patented, silicon based, two part wood surface treatment process with extensive use in the DIY market. The surface protector makes sure that the wood protector doesn’t leach out until it has cured. The wood protector undergoes a chemical reaction with atmospheric carbon dioxide to deposit insoluble silica particles in the wood, particles that give an even, silvery-grey appearance to the wood surface, looking just like weathered wood. The silica envelope that forms after is completely stable to ultraviolet light and its even, silvery-grey appearance to the wood surface is one of the most attractive features of the product. However, if not applied correctly the results will not reflect its performance. The best option is factory finishing as the product can be applied under controlled conditions. The product works best when there is good penetration of the wood material – rough sawn surfaces are always preferred. Where planed surfaces are specified it is important to sand the surface to break through the machining glaze that is often present in order to allow the product to penetrate the wood. Applying the product in direct sunlight should be avoided, since rapid drying of the water based product will limit diffusion into the wood. Application in damp, cold conditions is also to be avoided, since curing is slowed down and there is a risk that the wood protector will be leached out before curing has occurred. The best option is always using a factory-applied finish by a SiOO:X accredited treater, who can apply the treatment using brushing or spraying, offering the optimum performance of the product.