The floor of my recently inherited garage is in a bad way. The surface is disintegrating, liberating dust and aggregate, and leaving large but shallow depressions. The proper remedy would be to dig it up and re-lay it from scratch, but that's not going to happen. The alternatives that I envisage are a wash of dilute PVA, which doesn't strike me as being very substantial and probably not very effective or long term, or a layer of levelling compound, possibly after a preliminary treatment with PVA.
Thoughts and alternatives please.