Every morning during my morning commute I've formed a habit of taking note of the appearance or removal of tagging throughout my journey from Silver Lake into the Valley. Especially saddening is when I see residential homes covered in tagging, followed by the walls lining the freeways. It's a never ending battle between those armed with spray paint and the cleanup crews that come around to clean up the crime. I've always daydreamed of a coating for the home with a chemical composition that resists spray paint or markers from adhering to the treated surface. I was surprised a local Los Angeles company has a product that fits the bill... SEI Chemical of Northridge, CA has actually developed a product called Graffiti Proofer Anti-Stick, which literally causes graffiti to run off protected surfaces, frustrating the vandals, and making clean-up in most cases as easy as washing a window. A gallon of Graffiti Proofer will run you $135/gallon, which covers between 150-250ft. But I bet for a homeowner battling ongoing tagging, that's a fair investment worth considering the headache of defaced property.