Hey:
i get the shielding tap from a local electronics shop & i believe its called (3M) EMI shielding tape. They cut it into 12" x 6" lengths for me. It isn't cheap at $9.00 a pop & depending on the size of your amp, it could get costly! Maybe check ebay as well.
I always cut carefully to the panel i'm applying it to & most time i'll measure 3-4 times just to be sure! I never toss out any leftovers as its always good for finishing the trim around the top of cd players were the top cover mounts to the player body.
I simply start at 1 end & use the bank card/credit card method & it always gives great results. I recommend going slow becuase it is very tacky & high strength, if removed it will wrinkle really bad....as i've found out :-).
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1988 STR-GX10ES
1989 CDP-X7ESD
1989 CDP-608ESD
1990 CDP-C85ES
1990 CDP-C75ES(2)
1990 STR-D2020
1990 CDP-M19
1992 TC-RX79ES
1993 SLV-700HF
1993 TC-RX311
1993 CDP-C79ES(2)
1993 CDP-C801ES