To prepare my GF4 for my cold plates, I slapped on some liquid electric tape. The same stuff that UaZa put on the back of his Epox 8k3a+. It owns!

What I did for this was... I covered everything (including the GPU and ram on the front) with the l.e.t. and I then cut em out w/ a razor. Tada! Gotta do the back still :P