TileProf says: |
Hi Hasmuth,
Some people recomend a filler such as a resin, but we find if there is any movement such as Underfloor heating or tiled onto a wooden substrate then it doesnt last long and seems to come out easily, so best to use a flexible floor Grout such as Mapei Ultra-colour instead.
Regards Russell at Tile Doctor
http://www.tiledoctor.co.uk/Mapei-Grout-Shop.asp#Ultracolour |