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' by 6" by 1/16" (7.92 m x 15.24 cm x 0.6 cm) 1.5 lbs (680 g) I am wanting to put the Smooth-It product on an incline. My question is, can I keep it from running? For inclines up to 30 degrees (maximum recommended degree), it will need to have a thicker consistency. Mix 2-1/2 parts Smooth-It to 1 part cold water. Can the Smooth-It be used directly on Homosote? And should I first seal it with shellack? Yes, you can use Smooth-It directly on Homosote. Prior to applying the Smooth-It, sand the surface with 60 or 80-grit sandpaper. Do not use shellack. I have a layout that I will be moving often. Will the Smooth-It product work for the roadways or will it crack like regular plaster does? For this type of application, we recommend using Foam Putty or Flex Paste as an alternative. Sand smooth and brush on at least two coats Top Coat Asphalt or Concrete. Will Lightweight Hydrocal clog a water drain? You should not wash any Woodland Scenics plaster product down the drain. This includes Shaper Sheet Plaster, Carving Plaster, Super Strength Plaster, Lightweight Hydrocal Plaster, Mold-A-Scene Plaster, and Smooth-It. Plaster residue that remains after applying Plaster Cloth should also be discarded in the trash. Is it possible to slow down the work/dry time of the Smooth-It? Yes, you can slow down the setting time of the Smooth-It™. This is accomplished by using cold water in the mixture. To make the roads and sidewalks do I have to remove the paving tape after the smooth it sets? Yes. After the Smooth-It is set, you should remove the Paving Tape. On what type of surface do I model roads when using Smooth-It? Smooth-It should be applied onto porous surfaces, such as Plaster Cloth, Shaper Sheet Plaster, Foam Sheets or plywood. You can use Smooth-It to create a roadway, parking lot or other similar surface. We recommend modeling large projects in small sections. Use Paving Tape to outline the perimeter and then section off the interior into smaller segments. This will make the project easier to handle. Do you have any products and / or advice for making crowned roads (higher in the center), gutters, manholes, and drainage grates along the curbs, as are typically found in larger towns and cities with storm drains? To model a crowned road, we recommend using our Road System. Use strips of Paving Tape to make a form for the road. Instead of using single-layer strips of Paving Tape as noted in the instructions, stack two strips on top of each to make the road twice as thick. Prepare Smooth-It per package instructions and pour into the form. Remove the Paving Tape after approximately 30 minutes, and then let the Smooth-It finish drying completely. It is dry when it is no longer cool to the touch. Sand and shape dried Smooth-It with 220-grit sandpaper into desired crowned road formation. To add gutters, create forms with Paving Tape after the crowned road is completed. To add storm drains, use a hobby knife to gently score desired pattern into dried Smooth-It. Work slowly to avoid cracking. Use pieces of styrene to create storm drain grates and manhole covers. Paint paved areas with Top Coat Asphalt or Concrete. If I pour a section of Smooth-It and add another section at a later date, will the joining of the different pours adhere properly? Old and new sections of Smooth-It can be joined together seamlessly. Spray the original section with water and when pouring the new section use the Spreader to blend the two sections together. When dry, sand lightly with #220-grit sandpaper. I would like to color my Smooth-It prior to pouring it on my layout. Is this possible? Yes. You may use Earth Colors Liquid Pigment or any water-based paint (such as acrylic) or dye to color Smooth-It. Mix the colorant into the water before adding Smooth-It. When adding colorant, the color of the plaster will not be as vivid as when painted. It will have a muted, chalky appearance. We suggest doing a small test area to ensure the color of the dried product meets your needs. I will be applying Smooth-It to construction grade foam board. Do I need to "seal" the foam with anything before applying ? Smooth-It should be applied onto porous surfaces, so when applying it to construction grade foam, certain preparations must first be made. If there is a clear plastic backing material on the foam, remove it. Sand the surface of the foam with #100-grit sandpaper to give it some tooth, so the Smooth-It has something to stick to. Do not seal the foam prior to adding Smooth-It.