The Foundry has posted some (5) Nuke tutorials all dealing with Nuke Paint and roto including a tutorial on wire removal and painting geometry with RotoPaint.
Basic Introduction to Roto’ing in Nuke from Hieronymus Foundry on Vimeo.
Working With Layers in Roto from Hieronymus Foundry on Vimeo.
Animation In RotoPaint from Hieronymus Foundry on Vimeo.
Wire Removal With RotoPaint from Hieronymus Foundry on Vimeo.
Painting Onto Geometry With RotoPaint from Hieronymus Foundry on Vimeo.
