Hello Karl
We trade as CleanTile and Grout and are distibutors of Grout Perfect colour seal in the UK - Our preffered work is cleaning simple porcelain and ceramic tiles and colour sealing the grout whether floors or wlalls.
Fairly straight forward procedure for wall tiles.
1.Deep clean tiles and grout with an alkaline cleaner
2.Occasionally we will use an acidic cleaner if there is any limescale build up.
3.Apply colour seal to all the vertical lines-wipe over tiles after 1-2 mins
4.Then do all the horizontal lines and wipe over.
5.Leave for an hour and mist with water/agitate with a damp cloth and buff off with dry towel.
It is straight forward but requires practice like any new skill.
The good news us that the rehwards can be very good and the results stunning whether walls or floors.
We do a lot of Hotel bathrooms -either the showers or more often the three wall surrounding the bath.
Coupleof things to look out for are high grout lines and poor grout.
We carry out small grout repairs.High grout lines are a pain since the wipe off process wipes off the colour seal - with a bit of practice colour sealing the high grout lines becomes ok but we would still turn down bathrooms which have simply been regrouted. What tends to happen is that they regrout over the dirty grout which raise the grout lines.
Team of 4 can do 20 bathrooms a day and you can get any where between £65-£100 per bathroom (3 bath walls only)-cost of colour seal no mor ethn £50
Any way have a look at the website
www.cleantileandgrout.co.uk -there is a section on colour sealing.
If i can help further give me a ring anytime
Goodluck!!
Steve P
07831 249600/01256 882840