It'll stop electrostatic pickup, but not so good for damping magnetic flux.Aluminium foil lining the enclosure of an audio amplifier circuit, is it good as AC hum shield?
If this is about guitars, I have failed at that!I line the pickup cavities of my single-coil guitars (strat, tele...) and the back of the pickguard, and make sure the foil is grounded properly.
What could I be getting at home, a common domestic environment? No trafos nearby other than a small one inside my PSU on the bench and a CFL lamp.Foil can provide some protection against electric field interference but is of limited help for the magnetic field interference from power lines.
But hard if not impossible to get locally.Copper shielding foil can be had that has adhesive on the back, this stuff is great because you can solder the seams and it's really easy to solder a ground wire to it as well.
In the UK; the Lidl stores occasionally have rolls of adhesive aluminium foil for £1.99, it can be soldered if you buy a reel of solder that's made for soldering aluminium.Copper shielding foil can be had that has adhesive on the back, this stuff is great because you can solder the seams and it's really easy to solder a ground wire to it as well.
Aluminum foil is just 10 X harder to work with.
Have you tried crafts stores? Something similar is used in stained glassBut hard if not impossible to get locally.