Impregnated wood is very moist. In warmer seasons especially, the wood is susceptible to mildew or mould as it dries out. This can result in white spots on the wood’s surface. This fungus does not affect the quality or strength of the wood and is not harmful to health. These superficial imperfections disappear by themselves, but are also easy to remove Tip: Upon receipt of your delivery, remove any protective film to prevent condensation from forming underneath the film, as this will produce stains and mould on the wood.