What is the best way to seal/protect my mosaic glass stepping stones?

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I have already used an outdoor grout sealer, but I am wondering if there is something else to use to strengthen it more.
q what is the best way to seal protect my mosaic glass stepping stones, concrete masonry, gardening, landscape, outdoor living, tile flooring, This isn t a great photo but you get the idea It will be placed outside as a divider between grass and gravel
This isn't a great photo, but you get the idea. It will be placed outside as a divider between grass and gravel.
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