Ok, so I’ve mastered up two 7cm length entrenchment walls. One side consists of a wooden trench wall put together from match sticks, the other side is a dirt bank made from builder’s putty and spackle. The bank and wooden wall is topped with a bunch of green stuff sandbags.
The masters look good and they molded nicely but they’re difficult to cast without some bubbles occuring, mainly around the sandbags. After some experimenting I discovered the easiest way to cast the sandbags is to pour a small amount of plaster into the mold and work a stiff brush through to get all the bubbles out of the sandbag details. It’s not too laborious and results in a pefect cast every time.