EGCC
I don' t know about this particular aircraft, but I do know a little about the recent Thomson re-paints.
They are carried out by a firm in Maastricht. They have two shifts of about 12 blokes per shift, and work round-the-clock for a week to re-paint a 767. It costs around £60k.
It is normal to re-weigh after a paint job, but I'm not sure if it's a requirement.