As someone who does slaps, I'm no stranger to the idea of temporariness nor do I really try to combat it. My work sticks around then disappears, as I will eventually myself. As for the obsession of not getting buffed who knows, likely born out of the gang affiliated side of graffiti, same boneheads who fight people physically over turf, etc.. But since we were discussing obstructive protest I think it's worth a mention. Speaking of which - don't get a weed sprayer off of Craigslist and fill it full of paint, that sort of thing could lead to no good.