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Jeff, you need a "clay" as your base, something that is like a putty, malable and sets up in a few hours.
Games WorkShop (creators of Warhammer and Warhammer 40K) makes a two-part clay called "greenstuff". They have hooby shops all over North America and Britain. Its costs, I think, like $8 USD. The stuff isn't too sticky but you can wet down your tracks w/ water so the tracks don't stick as you make your impressions.
You also might be able to find a molding clay at an Arts & Craft store which is probably a cheap alternative.
You can use a rolling pin and modeling knife to shape the clay. Once placed on the your dio base, use your tracks to make impressions. To avoid things sticking, use water or flour.
Once the greenstuff sets, its very hard (about 24hrs). You can then coat with a powder to simulate mud or snow and/or paint.