| Foil! Don't forget foil, regular aluminum foil, which works well (prolly better than paint) and is super cheap. Spray adhesives hold it in well. Of course, I wouldn't want to use something like that on an instrument I was selling, but for my own use, it's great. I like to put electrical tape over the whole mess, since it hold all the foil down to maintain electrical contact, and protects it, and prevents shorting.
Has anyone used solid metal for their shielding? Maybe a mesh? Those would be cheap and easy to apply. | 
