any idea whats happened here and if its likely to go away?
Slabs laid on solid base wettish 1:6 sharp sand / cement On top of existing concrete.
not sure but hoping it's not similar to what you get when you spot bed and it shows through?
Any ideas welcome!
Not sure if anythings got on them. I'll try and get a pic from above of later
There was a strip which I wet concreted on the day before laying which I reckon might line up with most of the patches, was that a big mistake, reckon it'll eventually dry out?