Nails hands and feet: Ensure nails look sexy, not stained Base coat is essential to reduce the amount of discolouration that can affect nails, especially from wearing dark-coloured polish. But, apart from helping prevent chipping, top coat has its role to play in lessening discolouration, too – not least from UV rays and seawater, which can stain nail polish. Apply regularly over your polish and choose a brand that includes UV filters.

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