Ok, I managed to figure out how to describe in a better way what I would like to do. I would like to make a gun like the bio that shoots some kind of goo.
I don’t need to spawn the entities that represent the goo ball itself but I am trying to increase the smudge size and changing the properties of the surface where the smudge appears. In very short words, that would be typicaly the paint gun from Aperture Tag https://www.youtube.com/watch?v=6yd5CV1l1mY