Water Staining

Definition - What does Water Staining mean?

Water staining is a patch of mineral deposits formed at certain places when water dries up. Hard water contains high amount of minerals such as potassium, silica, calcium, etc. Water Stains and spots occurs on the surfaces when water evaporates and the left over minerals accumulate at that place making a dull patch on the surface.

Gloss on the surface is highly affected by the water staining. Moreover, these mineral deposits also has the tendency to react with the metal surface in the harsh climatic conditions and can cause cracks, pitting or corrosion on the metal surface.

Water staining is also known as water spotting.

Corrosionpedia explains Water Staining

Water staining can cause:

  • Discoloration of Paint.
  • Surface etching
  • Microscopic surface imperfections
  • Roughness on the surface

Water stains are vulnerable to deterioration and should be removed and neutralized as soon as possible.

The quality of water plays an important role in determining the severity of water stains and spots that will occur on the metal surface once the water evaporates. The types of minerals as well as the quantity of minerals present in the water is determined by conducting a TSS Test (Total Suspended Solids Test).

Water Staining and Spotting leads to different types of water spots, such as:

  • Type I water spots are called hard water spots. These are merely mineral deposits on the surface left behind after water with minerals has evaporated from the surface. These deposits can often be washed off with soap.
  • Type II water spots are those spots in which some gloss of the paint has gone or the paint has been slightly removed. Such spots are removed by first leveling the surrounding paint by hand or machine with some type of abrasive compound or paint cleaner.
  • Type III water spots are primarily a stain in the paint that looks like fading where water pooled for some time. In such type of spots, the paint and coatings are completely chipped of from the surface. This is a severe water staining condition and if not tackled will leads to leaks, holes or cracks because of metal corrosion.

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