Dirty / Sticky Project Idea

I have an idea that would show the effect of time. If I could create posters (or other mediums) that showed one message in light colors, I'm thinking type-heavy, that was printed with a light texture of shapes or words in a clear sticky substance on top, much like rubber cement, the debris / pollution / dirt from the outside world, over time, would eventually collect on the sticky substance and create a message over the printed poster's first intentional message. Possibly this could be applicable for some sort of environmental issue, the new Global Warming movie, or something humorously referencing NYC?