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To clean the rust, the acid you need is phosphoric acid (that's what is used professionally). You use it diluted in water at a concentration of about 10 to 15 % in volume. I don't know for you but I can find it everywhere (supermarkets) here in France in 2OO ml bottles (concentrated at >65%). It is not a very dangerous acid, but it's YOUR skin and eyes you're dealing with, so usual disclaimers apply ... It -dissolves- the rust, and works really very well. You pour it in the tank, let sit for a couple hours, rinse, dry (quickly as it will rust again), et voila. If the tank is almost rusted through you'll get a hole, as I said it dissolves rust, that's what sealing stuff is for, otherwise you don't really need the sealer. I use it to clean all sort of rusted parts with success. Lately I cleaned all the sheet metal parts of my engine. Bernard Seront serontb@free.fr ------------------------------------------------ To unsubscribe, E-mail to: <type3-off@vwtype3.org> For more help, see http://vwtype3.org/list/