Concrete Texture from Ammo is a relatively new product from their Vignettes Acrylic line. This product is designed for small and medium sized dioramas or vignettes and comes ready to use in a 100ml tub.
Borrowing from Ammo's own description: The application method is remarkably simple. You can use any kind of tool at hand and the CONCRETE TEXTURE can be mixed with other weathering materials such as pigments or acrylic paints to create a full range of authentic concrete effects. It can be used for any scale ranging from 1/16 to 1/72.
The dried surface mimics the look and texture of concrete beautifully. This particular texture can be sanded, after a through drying, to a smoother finish should you so desire. The acrylic base of Concrete Textures allows for easy clean-up and thinning with water as well as being odorless and non-toxic.