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…Atmospheric influences coming from UV light, sea water, acid rain, emissions,
pollutants, chemical products and/or industrial wastes entirely degrade the
organic coating and its degradation.
UV light radicalizes the polymer chains and increase crosslinking reactions.
Surface hydrophobicity reduces from 80 to 10º, where water can be absorbed
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https://www.wichita.edu/academics/engineering/sustainability/documents/Asmatulu.pdf