Woodland Scenics ST1452 Smooth-It

Smooth-It is a plaster material that is used to smooth rough spots, create streets, roads and parking lots. Mix with water and apply directly to any clean hard surface. One carton covers approximately an area 26 ft by 6 in by 1/16 in (7.92 m x 15.24 cm x 0.6 cm) - HO scale two-lane highway.