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Your second guess is correct. Wire brush the loose stuff off, dust area off, then brush on. It chemically stops the rust, turning it into a primer-like surface, ready to be painted. A no-brainer operation and rather effective. As always, read the directions. Though it may not look pretty at least you've stopped the rust and sealed the metal from further damage. Corroless is tough and dries to a dark red/rust color. Another brand I have dries flat black. Go to my web page, http://www.geocities.com/MotorCity/Speedway/1641/ and look towards the bottom of the page about Corroless. In the lower left corner of the rust image you can see what the black conversion stuff looks like. The second image shows what the Corroless looks like. It's my understanding that POR-15 is effective as well but I have had no experience with it. Toby Erkson air_cooled_nut@pobox.com <-- Please use this address for email '72 VW Squareback 1.6L bored and stroked to 2.0L, Berg five-speed '75 Porsche 914 1.8L, ORPCA member Portland, Oregon, http://www.geocities.com/MotorCity/8501/ >-----Original Message----- >How do these 'rust killers' work? Does the surface need to be taken all >the way to the bare metal or just the loose flakes of rust removed with >say a wire brush? Is a wire brush enough or would sanding be needed? Content-Type: application/octet-stream; name="TNF19.TMP" Content-Disposition: attachment; filename="TNF19.TMP" Attachment converted: Sarasvati:TNF19.TMP (????/----) (00004870)