I finally found it
 

An undercarriage rust preventative product.....

I'm gonna give it a go in about a month or so when I can get my hands on some.

http://www.eurekafluidfilm.com/appli...utomotive.html

Anyone tried it? I found an article about it here by a Landcruiser owner in Canada: http://www.risingsunimports.ca/news/2005_06_17.html

I've used Fluid Film on every vehicle I've owned since I was about 20 (ever since I worked for a mechanic who swears by it), but only on locks and bolts and such... I didn't know it could be used as an undercarrige protectant... Now I do... And I will...