bonehead,
perhaps you would kindly explain how silicone causes rust. i have had quite a bit of experience with silicone and find that it is usually pretty inert. i am talking about 100% silicone, not siliconized ...other caulk.

__________________
[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.