Well with the new car ( 90 SSE) we plan to keep that thing undercoating all the time, at least once a year.

I am just looking for suggestions as to what to go with. The last time we did the white SSE, it was a clear wax kind of stuff, that once heated up in the summer it tended to leak.

Then there is the old oil spraying, which has been around for years.

There is another one up here called Krown, not sure if it is available in the U.*. I have been told that unless you use this Krown from day 1 of owning the car it will go after the rust you currently have and actually make it worse.

Then there is a new one I am hearing about called Corrosion Free. I am not sure if that is the same as the one I used previously ( wax type substance), but I hear it is very good.


What have you all tried and what has worked?? I guess it might be different for me since I have salt to deal with compared to some that live in the warm south, hehe.

The corrosion free is the waxy stuff. It gets a little tedious getting off in summer (had put on both my LaCrosse and Bonny by dealer.) Suppose to be top level and the brand I got carrys a 10 year garauntee against corrosion through the GM dealer, not third party so I thought thats was cool.

i always thought that a undercoating traps moisture therefore promoting rust

Well I was reading more on the website for corrosion free, and here are a few things on it

The biggest reason why we use an undercoating up here is that with all that salt you want some kind of barrier between the salt and the metal.

This Corrosion Free stuff sounds to be pretty good, if it does what it says it does.

Here is one thing I found on the FAQ page.

So YES the traditional oil spray does trap moisture in, but this stuff is designed to pull moisture out, kinda like WD-40 then, hehe.

Only thing is that this stuff is over 100$ to get it done, well to get the whole car done that is, not just the underside.

Yep, and they do everything its on my wheel wheels, under hood, door hinge area, trunk.

You might want to look into this company. It was the NASA Spinoff Company for 2003 (selection is done by NASA). I have used their ceramic insulating paints for radiant and conductive heat applications with exceptional results.

They also have industrial metal treatment paints. i don't have extensive experience with them. I used a couple of their rust/primer products to undercoat a friend'* car at the NJ seashore. It'* only been 2 years, so it'* hard to comment on its effectiveness. But subjective results seem in order.

http://www.hytechsales.com/index.html

Click Paint Listings>Primers. See if there is anything of interest.