Mark S. wrote:
A while ago I took off the top inch of loose concrete on the ground
floor of my project.

I levelled it with compound to cover the dust/roughness more than
anything else.

It's been left about 12 months and there's a few patches where the
compound has lifted off and there's what I suspect is "salt"
underneath?

What "compound" did you put on it? Did you do ant preparation/treatment
apart from scabbling it off?


I think the damp course was a layer of tar like paint that had been
under the skim level that had become detatched/broken up.

"The skim". What's that, the "compound"? The black stuff is hopefully
bitumen emulsion.


Is it possible to fix it using anything within the inch or so that's
"spare" or is it a job I really could do without doing that needs
doing? :-(


If the surface is coherent, use bitumen emulsion again. If it's not,
take it back until it is, or dig it out & replace.


Just managed to save some money to get some work done on it too.

Shouldn't be expensive. What's the "project"?