A situation arose where I needed to mask areas of the forearm to spray dark grey. I thought about using Tamiya tape, but because of the complexity of the area I thought Vegemite may work as a more flexible masking agent in such an area.
To do this I added a little water to make the Vegemite a little more fluid than it normally is, then painted it on by brush. Any areas that I accidentally touched with the Vegemite that I didn't want to be masked I removed with a wet brush. The whole process was remarkably easy to control. I have used Vegemite on many occasions before with good results.
I then sprayed the dark grey Vallejo paint.
Then removed the Blu-Tack.