These were originally formed into the L-shape and painted with transparent paint, some highlight hots spots in opaque white. The smoke effect was then glued. I used a soldering iron to melt the top and sides to get rid of the straight edges. Then added the clear silicon on both sides to give a 3-D effect. This is around turn 11 of Rapid Fire as the Russians put a stop to the German Advance with a heavy barrage of their artillery.
