- Fun with plaster - Yes everyone, plaster. It is very excessable, and can be used for some big fun. One way is an improvement on the ajax bomb. You can mix water in the ajax, which I found more effective because it leaves a spot twice as bright on your target. Yet I have found another way. Use plaster in place of the ajax in the bottle. Mix with water until it forms a cream like paste. Now when you throw this at something, it will be a little harder to clean up. Hehehe.......... --------Vortex