My garage floor is probably 50 years old and is severely pitted, and decidedly not level. I don't mind it being un-level, but it's so not smooth that sweeping is much harder than it should be. Can I put a thin layer of self-leveling concrete on it to just smooth it out, or would it all pool in the lowest spots? I'm open to other ideas on how to get it smoother as well.
Why bother with self-leveling cement? Just use regular cement and a long straightedge to make it flat. Note that most of the smoothness of regular cement mix comes from working it with a "cement float" to work out the bubbles and help bring the "cream" to the surface.
If the slab is a matrix of cracks and divots it may be best to take a weekend to repair the damaged section. Depending on the size to be repaired and the extent of the damage pouring fresh concrete into an excavated slab will ensure you never have to repair it again. Here's how: Chalk the outline of what area on the slab is to be repaired (go back to sound undamaged concrete). With an abrasive blade for concrete in a circular saw plunge cut the blade into the chalk line (have several blades on hand). Cutting depth should be 1 1/2 - 2 inches. With a heavy sledge start in the middle breaking out the concrete. Stop and remove chunks occasionally. When you approach the cut line switch to a smaller sledge and cold chisel. *****Should I continue?*******