Here’s an easy surfacing trick to fix slippery concrete: Super-smooth concrete can be etched. Wearing safety goggles and rubber gloves, use a 25-percent solution of muriatic acid.
This powerful chemical eats away the thin top layer of concrete, exposing the sand that was originally mixed into it. This procedure leaves a slightly rougher surface, one similar to fine-grit sandpaper. It provides better traction underfoot — even when it’s wet.
Simply pour it on, let it stand for 10 or 15 minutes, and rinse it off carefully — using a garden hose. To make the surface still a bit rougher, repeat the process until it’s exactly how you want it. Consider it social security for those you love.