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I would like to make a grainy outdoor tile smooth for easy maintenance. I heard about a resin. Is this a good solution? How does the product age? (stuffed, stripping?...)

Your question lacks interest since usually I am asked rather how to make more rough outdoor tiles (paving terrace) to make it less slippery. Because obviously, putting an ordinary resin on a rough tile risk to turn it into an ice rink at the slightest rain. I advise you so formally, except to use a professional product containing anti-slip agents. You will find this kind of product, for example, on the following website:

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