Trash replaced by tags

In September, 2008, Randy wrote about a mural on the corner of E. Toole Ave. & N. 7th Ave. (119 E. Toole) that was half-hidden by trash. The trash has been there every time I've gone by -- until this morning. Here's the view today:

Instead of garbage, there's graffiti. I've wondered whether there's some kind of tagging-resistant overcoat that muralists could paint onto their work when they're done -- like the graffiti-stopping paint that's used on some downtown walls? It's too late in this case, I'm afraid...

(Update: When I rode by on November 25, 2010, the mural was gone.)