Waterproofing - Reproofing - Impregnation
Leather is waterproofed or hydrophobed to ensure water does not penetrate the surface. Leather specialists call it "hydrophobic leather" and end customers call it "waterproofed leather". Usually, shoe and clothing leather is already hydrophobed in the tannery to make it more weather-resistant.
A waterproofing treatment is only needed for leather which is sensitive to dampness and soiling (all porous leather like nubuck and suede and aniline leather). Waterproofing is usually applied by end consumers as an aerosol spray to renew the water-repellent properties.
Advantages of preventing porous leather from absorbing moisture:
- Breathing activity is reduced when water is drawn in. A completely wet shoe or a completely wet jacket is no longer breathable.
- Feet don't get wet and also the rest of the body is protected from moisture and cold (leather pants, leather jackets, leather hats, leather gloves).
- The leather objects don't get heavy due to penetrating water.
- The stain sensitivity caused by water marks is reduced.
- Sensitive leather looks used and becomes stiffer after becoming soaked.
- Waterproofing treatments can also reduce certain types of soiling.
Important! A waterproofing never makes a leather as water-repellent as a surface colouration. Waterproofing does not completely protect. Sensitive leather should not be exposed to bad weather, despite waterproofing.
Important! Waterproofing sprays can damage the lungs. Therefore, always observe the safety instructions. If sprayed outside and not in direct contact with the spray mist, there is no danger. The highest danger is spraying in small, enclosed rooms without ventilation. The lungs don't absorb oxygen, causing suffocation. For this reason products have a strong smell to avoid inhalation.
The most effective are aerosol and solvent-based waterproofing products. At the first treatment, waterproofing must be applied several times and must be sufficiently dried. Heat increases the water-repellent effect.
By applying an aerosol water-repellent, the breathability of the leather is reduced by about 5 to 10 percent. Since waterproofing is generally applied to very porous leather, this reduction can be neglected.
Important! Waterproofing is frequently seen as "leather care". However, water-repellents only have the function of preventing water penetration. Leather care is to preserve the good condition of a leather as long as possible. In addition to protecting against the penetration of moisture, leather also needs a re-greasing depending on the type of use, so that it remains soft and/or UV filters, so that it does not fade and/or frictional wearers so that it does not wear so quickly. Therefore, waterproofing should never be considered to be sufficient "leather care", but only as moisture protection. The leather would otherwise dry out and get brittle over time.
Warning sign for leather pants made of stretch leather.
Waterproofing is unsuitable for surface-coloured leathers. It does not have any care properties despite making them water-repellent. It makes more sense to maintain such leather with a suitable care product.
The water drops have changed the surface. The edges of the water marks are swollen.
Video about the water sensitivity of leathers
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