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Is it a terracotta dish? If so, you need to seal the dish first before you mosaic so that it won't absorb water ( this will protect it from freezing and cracking in winter, although I don't know how much frost you get in GA), then mosaic, then after grouting, I would seal it again. You can probably use the same sealer for both, Hobby lobby has a mosaic sealer and I believe it says outdoor sealer... you can also purchase a Marine sealer at either HD or Lowes which is used for water resistance. Go to the hupertufa and concrete forums also, they asked the same question there and I don't remember what else was recommended..