They could possibly polish it using hand tools rather than the bigger machine they usually grind with. I'm sure I've seen the polished edge somewhere so it should be possible. Keep us posted.

If Scali doesn't step up then you can camoflauge it with paint. Experiment beforehand with a tube of black, grey and white acrylic paint and a stippling brush. Mix up different blends until you have the right colours and stipple it on. Start with a base coat of grey. Let it dry on an old tile or similar before assessing the colour as correct. The good thing is that you can wipe it straight off with water if you make a mistake or it doesn't match. When we replaced our kitchen there was a patch of raw pine exposed on the floor. I painted it with watered down acrylic paints and painted in some knots with brown paint and no one has ever picked it. Took a few tries to get it perfect. I assure you it won't stand out like it does now. i've even used texta to hide scratches on furniture and polished floors. You might consider that as an option too. Lastly I spilt scented oil on a my dressing table and it created a white film. I put some Brasso on a piece of cloth figuring I had nothing to lose and it's supposed to work on water rings on furniture. It took the white film straight off with no damage. You could try some on a cotton bud to see if it helps. You never know. Good luck.

hi yes batches are different from batch to batch, but the finishers, toner, and self levellers, grout, are all different and have differing impact of the finish. Two of my Grandsons work in the concrete polishing industry (have for years)and come across this problem every other day. They are so very used to fixing up concrete pourers blues. I do know of some extreme difficulties (some over forty years old under carpet that have had the same problem) that have given my boys a hard time. However, at the end of it, using the right gear, you can literally see your face in the reflection plus the reflected image via the window.

I remember hearing of the product in the original question, name added in a subsequent post. My immediate thought was that preparation of the surface is crucial and even more so for this product as it is very thin. This is what I found on the manufactiurer's website. "As far as old ceramic, cotto, stone, marble or PVC floors are concerned, make sure they are sound and firmly fixed. The existing floor must be dry, stable, sound, perfectly flat and clean, which means that there must be no brittle fragments compromising adhesion of Kerlite Plus. Flatness checking should be performed using a screed with a length of at least 2 metres. Place the screed on the old floor in all directions and, if necessary, compensate for any differences in level." https://www.cottodeste.com/solutions/faq?_ga=2.261653453.1349840659.1675227047-1392414663.1675227047