Wrong and I think you mean the Forth Rail Bridge! Also note there are two Road bridges plus the rail bridge!
"Painting the Forth Bridge" is a colloquial expression for a never-ending task, coined on the erroneous belief that at one time in the history of the bridge repainting was required and commenced immediately upon completion of the previous repaint. Such a practice never existed, as weathered areas were given more attention, but there was a permanent maintenance crew. Between 2001 and 2011, the bridge was covered in a new coating designed to last for 25 years, bringing an end to having painters as a regular part of the maintenance crew.