Clay is an earthen material, moldable or plastic when wet, non-plastic when dry, and permanently hard when baked or fired. It is widely distributed geographically, and often found mixed with sand in soils of a loam type-a mixture of clay, silt and sand. Relatively pure clay is not usually a surface deposit, although, in some cases, it may be exposed by erosion.
There is a difference between sealing grout joints and sealing tiles themselves, and depending on the type of tile you’re installing you should use one or the other.
Glazed ceramic tiles only need to have the grout sealed. Sealing tile grout gives your tile surface greater water and mildew resistance, and is indispensiable for keep ing grout from getting dirty. Unsealed grout will absorb dirt, grease and grime such that it becomes impossible to clean.
There are two major types of tile grouts- cement-based grout and epoxy grout. Grout used for tiling is not the same as caulking, which is made up of elastomer and is used for filling gaps between assorted building materials.
Cement-based grouts all have a portland cement base, but vary in the kinds of additives they include. You’ll find they typically come in powdered form to which is added water or liquid latex. Latex-portland cement grout is the most adaptable grout for residential use.