Thye guy that did the major metal work on the 73 told us about it. Said he's used it for a long time, and still likes it. It's acid, and it reacts with the rust to "convert it"...So, we decided anything that makes the rust quit growing & die was good with us and got a small bottle. Well, we used it on pretty much all the slightly scaley surfaces on the car (after a wire wheeling). I just used it on the inside of the pass side fender (and am now hiding in the house because it STINKS). Just wondering if anyone else had experiance with it and what they thought (especially interested in long term). If it does as it says, we will likely use it on other parts of the car as well-especially on impossible to reach places, like the inside of the deck lid (between the two layers, that empty space). It is meant to be top coated, so we'll have to find a way to do that...