Is the waterproofing valid for life?

The water resistance of watches is understood for a new watch with gaskets, a glass and case in perfect condition. If the water resistance is ensured during manufacture and is proven when the watch leaves the workshops, it is not guaranteed 'for life'. The duration of this water resistance can vary over a more or less long period depending on the characteristics of the model, the use that is made of the watch and the care given to the watch. The normal aging of the gaskets that ensure water resistance is accelerated by thermal shocks or strong temperature variations that cause the watch to go from full sunlight to cold water or a humid environment.