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Sol gel process for producing hydrophobic transparent films for polymeric substrates, the process relates to the sol-gel reaction of silicon alkoxide carried out in certain conditions. The sols obtained were, without limiting, spin- or dip-coated onto polymeric substrates then thermally cured into transparent-abrasion resistant coating. Such coating transmit visible light, but absorb wavelengths of ultraviolet light which cause degradation of the substrate surface and resultant adhesion-loss of the protective coating upon weathering.