First of all what exactly is it? Second I thought this was an additional test done on the older aluminum tanks made from the 6351 alloy? I have a 30cf Catilina that is only about 2 years old and one of the VIP stickers on it says Eddy Current. See the top sticker. Is it done on all tanks now? Is this required on all tanks now? Just wondering, because the 2004 sticker doesn't say this. Can I remove the top sticker? It doesn't make any sense having a 2003 and 2004 sticker.