The nano particles organise themselves to form a coating and bond with the surface after application. When the surface is smooth and not absorbent, nano particles combine with the surface, so liquids are repelled taking contaminants with them. With porous surfaces, the nano particles fill up the pores from the inside. Fungus, lichen, algae and moss (in and outside) can no longer adhere to the surface. Dirt and liquids can't get into the surface anymore and are simply repelled. This is similar with textiles (natural and synthetic fibres), the fibres are surrounded with the coating. Dampness and dirt can no longer get through the fibres and is simply repelled. The treated textiles are completely harmless to skin.
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