The final preparation for the groundwork on this piece was completed a few weeks ago and is outlined here in this post. Fine sandy dirt was glued to the putty surface with a thinned mixture of waterproof Elmer's Wood Glue and water.
After this dried I applied a thin sealing coat of the same glue mixture and sprinkled model railroad static grass in patches that will stay glued by absorbing that sealing coat. Once dry I was able to mask the wood and spray the entire structure with white automotive primer.
Once the primer coat was dry I removed the masking tape from the wood and began applying washes of brown and black oils. The picture below shows the base after the first initial wash of Burnt Umber with Black shadows in a few small spots. Further washes of various colors and tones will be added before I began to drybrush the weathering tones on the wood.