In my kitchen, I have an area of concrete floor. It appears that some time
in the past, this was covered by quarry tiles that were later removed
(possibly due to an uneven floor) and cemented over. Some of this top
layer of cement is coming away.
I have to replace this cement with a new layer, and it varies between
about 3/8 to just over 1/2 inch thick. Some of the concrete will be walked
I suspect that ordinary concrete will not stay there for long without
breaking up as the layer is so thin.
I vaguely seem to remember that you could mix an "adhesive" type substance
with the cement, or possibly paint it on the old cement first, to stop it