He's quite fun at times, but does display a lot of ignorance (or at least acts that way for the camera). He touches the bridge pickup cover, which isn't earthed, and says "it's fine". Also, you really should check for continuity on the ohms setting, as screening works up to about 1meg ohm, it doesn't have to be <1 ohm.

I can get very cheap copper tape on eBay, Fender3x, which does take solder well (at least for me) from eBay. Say US$8 for a 30m roll of 1.25" tape. But even with the conductive adhesive stuff you still need to check for continuity between strips and I find I often need to put another strip crosswise over strips running parallel to get good continuity (I have no idea why as there is always a decent overlap). I have bought much more expensive screening kits in the past with a mixture of thin tape and large sections of thin copper which can look neater, but now just use the tape.