Your sealing the grout, not the porcelain tile. The tile probably won't accept any sealer. The tile has a glaze over it already.
You should seal the grout lines. Aquamix makes an excellent sealer product and can be found at any good tile specialty stores.
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Matt
Cupan Custom Tile and Paint
Charlotte, NC
[URL="http://www.cupantileandpaint.com"]tile contractor[/URL]
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