Depends what is causing it to be uneven.
A lot of paths simply haven't been made on an adequate base and/or are
too thin - so they crack and become uneven. If that is the case, the
only solution is to dig it up, put down a proper compacted base, and
pour concrete to an adequate thickness, putting in expansion joints as
If it is just an uneven surface, then a sand and cement screed will do -
the rougher the surface the better, to give the screed something to key
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