Sometimes there are pink or yellow stains on PVC boat covers and tents, amongst others. This also occurs regularly on yacht sails. This phenomenon is known as ``Pink Staining``.
Pink Staining is caused by minuscule organisms, so-called micro-organisms, that are present everywhere. These organisms feed on components in PVC coating, amongst others. These organisms thrive particularly well in moist, warm environments.
The excretions of these organisms are pink, black, or yellow (dependent on the type of organism). This makes the presence of these organisms visible in the form of stains. These stains have no negative effects on the technical quality of sail or tent cloth, but can have a bothersome visual effect, especially on lighter colours.
This formation of stains happens indiscriminately and cannot be prevented. It is caused by environmental factors and can affect all qualities of coated cloth. Unfortunately, neither we, the supplier of the coated sailcloth, nor the sail maker can do anything about it.
The risk can be limited by sealing the edges and stitching holes with a good coating or impregnating agent after assembly of the sail, boat cover or tent, so that the textile is not exposed.
Stains usually occur within the fabric, just beneath the coating. Hence the stains being impossible to remove.