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Remember to allow the water behind the tile to bleed out on the bottom. I have done both grout and caulking. I really like Polyseamseal. Flexes well and it doesn't degrade in 2 -3 years. the only thing is, a tiny bit of water will collect back there and mold will grow especially during winter months. Grout will breath a bit better, but I know it will spit. No big deal with the wetness since it is so little back there.
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