PHospho is a rust converter that you can use as a primer . . . paint it on, until the red stops bleeding through, then cover with paint. Can get it at Marine Shops.

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1983 300D, the "Avocado"
1976 240D, 4-spd the "Pumpkin", SOLD to Pierre
1984 190D, 2.2L, 5-spd, my intro to MBZ diesels, crashed into in 2002