rust repair for good.

I have an '86 Turbo-look coupe that has had developed some rust. They're supposed to be almost rustproof from what I here but I have proven this wrong. I think it was neglect by PO. Anyways, these spots are not visible unless you pull back some rubber molding to view. One is on the mating surface between fender and body at rubber seal up near windshield. Another under molding in rear 1/4 window.

Now my question. What is the best way to kill this rust permanently. Since they are not visible it doesn't have to look pretty. Maybe grind to bear metal with dremel then special solvent A, followed by special primer B and top off with wonderfull paint C.

Thanks to responses to previous posts.

I've been using Por15 on surface rust on the non-visible parts since I've disassembled my whole front end for a new suspension pan. It's at www.por15.com, and highly recommended on this board. I'd love to hear from anyone who has had this product on their car for a number of years to find out how long it lasts.
Brad

Last fall I used por15 to repair some rusty metal both on the inside and outside of my Range Rover. I followed por15's instructions to the letter. First cleaning the metal, then using their metal prep product before finally applying por15 paint.

The initial results looked great. The metal seemed to be covered with a thick layer of protective coating. But after looking at the metal again this spring after a winter of salt-road driving, the protective coating has all but disappeared. I haven't checked the insides yet, but the outside results have been disappointing to say the least.

Perhaps I applied the product wrong? I'd love to hear other people's successes/failures.

Boris
1987 Carrera
1995 Range Rover