REPEAT from a previous message string:
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okay - step by step here....
A) First, use ACTIVA "Air Dry" Clay... not miliput... Activa can be found in most chain store hobby and craft stores. As the name indicates, it is self-harding, and needs no baking.
B) roll out about a six inch "log" by taking a ball of clay and rolling it back and forth between your hands.
C) lay the "log" on a hard surface, and gently press it down from it's rounder shape to a flatter "long pillow" shape.
D) for 1:35 scale (really, is there any other?), cut sections of the pillow about every 3/8 to 1/2 inch.
E) Lay the bags in place... over armor, walls, ground fortifications, etc. Build an interlocking wall as high as needed.
F) Take medical gause and wet it under the faucet. Wring out the excess water so you have a damp cloth. Press this into the clay and be sure to overlap several time to get a really nice looking grain.
G) Once this is done, take a dull xacto blade, and cut a few "seams" into the sides of the bags, and add a few "tears" as well...
H) Allow this to dry overnight and it will be hard as a rock the next day. You may now sand and file as desired, and then paint and weather as usual. Add in some earthen color pastel chalks to give a nice flat dirty / dustry patina. Be sure to put some loose dirt in and arount the bags to account for overflow, spills, and tears.
There is a DIGITAL DIAMOND on this very subject coming out soon, complete with illustrations. Look for it in the FEATURES/SECTIONS area.