Graffiti back despite recent cleanup

So here's the deal. You did an excellent job of removing the mass graffiti from the back of the main Cross wall, as well as the newly sprouting stuff elsewhere. Thanks.

However, that wee pest is back for the 3rd time since the Cross was first repainted.

You send me a spray can (or std tin) of that correct shade of grey and every time the wee moron reinstates his signature, I'll overpaint it - for free. Trust me, he won't win...