Hi George, thanks for the reply. There are touch up kits for Dow chemicals - Henkel make one and you can get it from aircraft suppliers like Skygeek. One guy I read about here in New Zealand tried in vain to find the right treatment for his motorbike mag wheels and ended up going to an airfield where a helicopter engineer mixed up and gave him some in exchange for a few beers.
The more I read, the more I want to use a modern non-toxic treatment! I've ordered a quart from the USA and will try it on the non-critical parts of my FIAT Dino engine (casings, covers, sump) and see how it goes. At least they don't spin at 100MPH and take all sorts of shocks.