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Sodium silicate can be diluted in water and will have some sealing properties when absorbed into porous clay surfaces. But, of course, it will shrink as it dries, thus not completely sealing. However the product "Liquid Quartz" is claimed to be very effective for ceramics because it is doped with nano-sized particles of quartz. It is claimed to be a non-toxic, food-safe, water-based sealer. It is also much more expensive than other options.
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