Use as ground cover where you need gray powder.
You can use this to build up your base to reduce the cost of the ground cover.
Just pour into areas that need additional build up and apply 2 parts glue and on part water to glue in place. Then sprinkle the color you want to the top while still wet. To read more visit Model Railroader Forums.
Rock powder, rock dust, rock powders, rock minerals, rock flour, soil remineralization, mineral fines, ground cover, dirt, and powder consists of finely crushed rock, crushed from larger rocks containing trace of a wide verity of difference rocks