You make stamped concrete not slippery by adding a textured finish to it. A good textured finish will add some grip to the surface and help keep people from slipping on it. There are a number of different ways to add texture to stamped concrete, and each method will give you a slightly different look and feel. Some of the most common methods include stamping with a texture pad, using exposed aggregate, or adding a sealer that includes a colorant or additive for texture. Whichever method you choose, just be sure to test it out in an inconspicuous area first to make sure you like the results.

There are a few ways to make stamped concrete less slippery. One is to increase the texture of the surface by using a stamp with a more pronounced pattern, or by adding sand or other gritty material to the concrete mix. Another option is to treat the surface with a sealer that will make it less slick. A third possibility is to apply an anti-slip coating to the surface after it has dried.