ACF50 is not the same thing as WD40, similar but more effective. It is a good corrosion inhibitor but requires an occasional clean and re-application, not a once only treatment. It has excellent "creep" qualities and gets into those areas where corrsion can easily start. I have used it on helicopters operating in the North Sea and they didn't rust away! The Harley guys seem to use it quite often on their bikes as it doesn't bake on and leave any crusty residues on the hot bits. Good stuff.
For areas not seen so much, like around the rear wheel, I would suggest something like LPS 3 as it is a longer lasting waxy coating. The best way to reduce the corrosion attack on the poorly protected M3W is not to expose it too much in the first place. For me, when the salt goes down on the roads it stays in the garage. Not a popular move with many I am sure but it will be interesting to see how things are looking after 2 or 3 winters. I don't enjoy freezing my parts off in an open car with no heater in the winter, so no hardship if it stays indoors for a few months.
