There's more small print that says if yearly inspections aren't done and actually registered with the company they don't have to honour squat. Like I said before, scam scam scam. I had an elderly neighbour that got ripped off for any sort of coverage for that exact reason, they said she never had it inspected and registered yearly, therefore the electronic rust module company didn't have to pay anything for damage that occurred. Freaking criminal.

X's 2!!!:tup

^^^ That's what I do.

I'm interested in installing some rust protection, but I don't wanna go with the dealership's offer - it's really overpriced. If I go to an independent local guy, am I at risk of voiding my warranty?

I really can't see hoe you would have warranty issue, unless they physically damage something during the process.

Read the article below these are snake oil. They do work but only if the metal is constantly immersed in water like when it's installed on a ship.

http://www.theglobeandmail.com/globe...article535224/

I found a great article in the globe and mail (http://www.theglobea.../article535224/) showing how overpriced the erp's are when the dealer sells them. so i decided to check out the krown blog to hear their thoughts on electronic rust proofing (Thinking of Electronic Rust Protection? Think again..) and came across the list of products recommended by the Automobile Protection Agency - thought I should post it here for folks:

http://www.apa.ca/se...ustproofing.asp

They give a pretty good run-down on how dealers profit but drivers are overcharged with these devices. They also list some trusted rustproofers from Canada.

The link doesn't work for the apa list

my mistake! hope this works.. Automobile Protection Association | Services - Rustproofing

I tried the electronic module from Crappy tire which I think is the same thing as the dealers now sell. It drained the battery (over time) so I disconnected it. I contacted the manufacturer and they said the draw was normal.
I think the concept was decent - pipelines use cathodic protection systems to prevent corrosion so I thought I'd try it. There is a small constant draw on the battery and according to the manufacturer will not be a problem but it killed my OEM battery after a few years and if I let it sit for 2 weeks the battery wouldn't start the car. I believe the battery should last for about 5 years so I blame the early failure on this constant small load, nor did it seem to stop the rust on the undercarriage or rotors etc.
I have used the Rustcheck product in a can from Crappy Tire also and that seems to work OK on body and door panels but not really on the undercarriage. I have also used that black underbody undercoating but it seems to peel off. A few years ago I did a roof repair and found (also at Crappy Tire) a spray roof repair. Yup - I read the label and it says 'Inhibits rust' so I tried it on the car and found that it works great and doesn't peel as the other stuff does and pretty much stays on - of course not on the rotors which I just paint now. It is in the roof repair section at CT and is made by Black Knight. A spray can costs about $9 and is also available in white and aluminium colours.