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We often recognize fluid in the home. Black spots in the upper corner of the bathroom or musty-smelling properties that have been stored in a too humid cellar for a long time. But many still think that when a car is parked in a garage and therefore has "a roof over the head" it is not susceptible to corrosion and mold in the interior. Especially when the garage is also heated. On this page we explain why this is a misconception and how you can keep your classic car and motorcycle shiny and free of corrosion, mold and bacteria. But first a short explanation of what relative humidity is exactly.

Air can contain a limited amount of moisture, depending on the temperature. The humidity is usually expressed as "relative humidity". The relative humidity is the percentage of the maximum amount of water vapor the air has at the temperature and the atmospheric pressure (the pressure in the earth's atmosphere). In Western Europe and Great Britain, the average value of relative humidity is between 60% and 90%. Hot air can contain more moisture than cold air. This means that the humidity in the summer months is higher than in the winter period.

If metals are exposed to air with a high air humidity, this air will form a chemical compound with the metal. This is also called oxidation. Corrosion is caused by oxidation in ferrous metals.

Bacterial growth and mold formation are caused by moist ambient air and little ventilation. Bacterial growth and mold formation cause the musty smell in classic cars that are often wrongly attributed to the smell of old leather. This is also a myth. The seats in classic cars often contain animal hair (often horsehair) and that is the ideal breeding ground for fungi and bacteria. The more humid, the more mold and bacterial build up in the interior of your car.

Where many people think that their classic car is most at risk in a cold winter garage, the opposite is true. When the temperature rises, the air humidity rises and with it the risk of corrosion, mold and bacteria.

Corrosion can be prevented by drying the ambient air and thus reducing air humidity below 50%. In this way your classic car or other valuable items will be protected against loss of value. In addition, bacteria and fungi have a less suitable environment to multiply and no unpleasant smells.

Relative humidity


Mold and bacteria

The danger lies at pleasant temperatures

Your classic car and motorcycle free from corrosion, mold and bacteria