Rockite Fast Setting Cement Expands as it sets, never comes loose, never shrinks. Mixes with water only, sets stronger than concrete in 1 hour. Good for all interior and exterior (if painted or waterproofed) jobs. Use to anchor bolts, screws, railing, glass railing etc. Use for patching concrete and brick, etc. Use to speed up fence post setting, etc. Dries gray. Packed in plastic bag within box.