[Floor_Tony]

So are you doing the whole floor with a flex machine then?

[Kev Martin]

Derek

You might be enjoying your mistake a lot but have you considered that it probably isn't your mistake?

You said you used an acid cleaner and this happened! I assume you then neutralised it? Now you are going at it with everything you have when the deep etching has probably been caused by year's of splashed urine.  A set of hand diamonds, a spray bottle of water, some penetrating enhancing sealer and a couple of hours work would have sorted it.  A full blown 4/5 stage grind with a Makita or any other make of hand grinder will probably do more damage and you probably still won't get it all out if it is uric acid etching over a period of time.

Sledgehammer to crack a nut springs to mind IMHO

Kev Martin
Tiling Logistics

[derek west]

i have hand diamonds so will try that first.

[derek west]

tried the hand diamonds and gave up, got the machine with dry diamond pad, (60) took about an hour to get
deep enough then swapped to the makita and went through the grits till i got the desired colour, not perfect by any means but customer happy and a big lesson learned for me. happy days

[Kev Martin]

So what did you seal it with?  Did you explain to the customer that the first splash of urine will acid etch it and send it white again?

Kev Martin
Tiling Logistics Ltd

[derek west]

sealed it with enhancing impregnator, and yes gave them the acid speach.