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Grouted ceramic tiles on a galley workspace .... should be nominated for ***incubation / growth site of wild and strange bacteria/dirt of the year in boats*** award of the year 2010.
Tile ?????? There is no way to 'seal' the grout, .... not latex caulk, not silicone, not 'urethane coatings over the grout, etc. from contamination on 'tiled' food preparation surfaces. Plus, grout is going to be an eternal 'bitsch' to keep keep remotely clean.
Just like 'tiled' drainboards and workcounters, etc. installed in the 1970s in houses ..... Dont use grouted tile as a galley workspace. Corian, formica, cultured/manufactured stone (not 'tile'), thin granite or marble, etc. .... but not 'tile' with grease, stain, and dirt imbedded 'grout'. Yucckkkkkk.