Shielding non-metal enclosures

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Go to home depot/Lowes etc etc. and buy some 2" wide aluminum tape, It looks like thick smooth aluminum foil with adhesive and paper backing. Usually it's found in the heating/ducting departments for joining duct sections in houses.  The brand I use is made by "Duck"

Aluminum isn't solderable for the most part. Aluminum won't stick together with typical electronics solder.
Try soldering to a soda can!!!

For the first piece you can just rip off a piece the length of the box and press it down inside your box...

For the second piece:  With the paper backing still on, take a length of the tape (large enough to go from one side of the box to the other like the first piece, following the bottom and sides) and fold a quarter of and inch over itself down the length of the piece. Peel off the backing paper and fold the stcky sides together. You now have a 1 3/4 inch length of aluminum tape.  Now apply this to the fist piece overlapping about 1/4 inch.

So what you are doing is making it so each piece is electrically contacting the previous piece. What I usually do is lay out all my strips overlappeing and so that the whole inside is covered. Then I take clear packing tape and cover all the areas except where you want to make a ground connection (under pots, switches, jacks, etc.)  This makes a nice way to hold down the overlaps and also to insulate the main body of the pedals inside. You will often have to run the tape in more than one direction depending one yor box  shape. As long as you have some folded overlap that touches the piece under you will be fine.
You can take a DMM or volt meter and measure continuity/ beeper to see if the pieces are touching conducting as thety should.

Then I cut the holes out from the inside with a exacto/razor knife. It's hard to make the shielding look clean but it does work well.

Fold over about 1/4 " of the length of the tape	Side view of the fold and how it should be layered
Bottom lid shielding
	Inside the box after shielding

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