well i took the time this morning to wrap two of the cups with foil tape up to 1" from top. i used a little salt water in-between the cups to conduct over the seems. i got 1.5uf with two cups. the thickness of the cup is .010", with foil tape .014" cross section of two cups put together .024". at a theoretical 500v pierce voltage that's 12kv. this is pretty interesting, the experiments go on. regards marc