We received a request to take a look at these Sandstone flagstones at a house in Grange over Sands, the request implied all was required was a usual clean and Re-seal however once we took a look at the floor it was obvious a lot more was involved and the floor was in need of restoration work including Sandstone floor restoration including grout replacement and paint stripping.
To get the floor clean I decided to apply a strong dilution of Tile Doctor Remove and Go combined 50/50 with NanoTech UltraClean to give it more cleaning power. We normally use Remove and Go to remove old sealers but it works just as well softening up paint splashes so they can be removed. It was left to soak into on the flagstones for a good twenty minutes before being scrubbed into the tiles with a rotary machine fitted with a scrubbing pad. The resultant slurry was removed using a wet vacuum and the floor washed down so we could get an idea of the improvement in the floor. There were quite a few stubborn areas so the whole process was re-done until I was happy the floor was as good as I could get it and at that point rinsed the whole floor down again with clean water to neutralise the floor before dealing with the missing and loose grout which was replaced with a close a colour match as possible before leaving for the evening so the floor could dry overnight.
Sealing a Sandstone Tiled Floor
We came back the next day and tested the floor with a damp meter in a few different locations to make sure no dampness remained in the stone. The sandstone was dry so we proceeded to seal the floor with Tile Doctor Colour Grow which is an impregnating sealer that occupies the pores in the stone preventing contaminates becoming ingrained there and also as its name suggests brings out the colours in the natural stone.