Grout between wall-tiles, particularly in damp areas like
is one of the most unsightly problems, it usually starts off in the
wettest area of the room, this could be the bottom of the shower or
bath, then starts to spread and if left unchecked could cover a
large area of the wall.
answer is obvious; protect the grout using a sealer. Although
relatively unknown, protection awareness is growing.
Mexican terracotta in particular is very porous and