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Building the Base
I used pink wall insulation foam (because it can be easily sculpted using various tools) to make my terrain board. I took a large piece of foam and then glued 3 pieces to the board in the approximate location I wanted hills to be located. I glued them with Liquid Nails. I had to glue it twice because I didn't wait for it to dry after my first attempt. Make sure your glue dries fully before you do anything else to the board.
Carving
I used some rasps (picture left) to carve out the hill shapes I wanted. I got foam everywhere. Make sure you do this step in a well-ventilated location because the foam can be toxic.
Adding Plaster
Next, I used Sculptamold mixed with bits of cloth and other paper waste to cover the entire board. The paper waste gives the board texture.
Priming the Base
I used drywall primer I had on hand in order to prime the base. The primer allows the paint to stick and covers the pink foam.
Painting the Base Brown
I then painted the entire board brown (like dirt). The brown is a bit light, but the only part that will be visible is the edge of the sandstone cliffs. The rest of the ground will be covered by grass or dirt.
Adding Dirt
I used actual dirt that has been sifted (to make sure the dirt was of a consistent size). I used a mixture of 1/2 glue and 1/2 water to hold down the dirt. I painted the mixture on and sprinkled it with dirt. I waited 2 days for the board to dry, then shook off all of the extra dirt. I repeated this step multiple times until there was proper coverage.
Adding Foliage (And Final Product)
The fake grass can be found online. I used the glue mixture explained above to glue on the grass where I wanted there to be foliage. I also glued on some crushed dried leaves (actual leaves) to give some texture to the board.
The bigger bushes were first covered in a mixture of water and dish soap (I used Dawn). Then I glued them down with the glue mixture. Unfortunately, some of them didn't stick and fell off the board
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