Here in the Netherlands I'm supposed to do a big assignment spanning over a couple of months. Without doing it, I won't be allowed to make my exams, so it's pretty important. I chose to do it about Chemistry (with, as a minor subject, physics). As a subject I chose to work on an anti-grafitti agent (is that the right word?) I wonder if anyone could give me hints on where to start. I suppose actually looking at the ingredients for spray paint is a nice start, but for the rest I don't really have ideas on how to proceed.