Shower wall porcelain tile crack repair A large format ceramic tile in a shower wall cracked on installation leaving a 45cm hairline crack. After careful filling with ceramic filler and some enamel work it is very hard to tell it was broken. 1 Hairline crack on left side 2 Closer view 3 Crack filled 4 And polished 5 Crack has disappeared 6 Owner very happy! see more repairs