I just inherited a <cough> Buick from my mother in law. At one point, the battery leaked and the car now has a rusty frame rail. I know there is a product out there that can convert the rust into a protective coating, but I don't know what it's called or where to find it. I'm not concerned about the way it looks. Did I mention it's a Buick?

Have a look at this product.
http://www.magnetpaints.com/underbody.asp

This is probably the most popular set of products out there:

http://www.por15.com

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Willy

'94 E420 White

Mods
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Berg Werks Keyless Entry
Buzzer replaced with Chime
Dash Light Upgrade
Burlwood/Leather shift knob
Alpine CDA-9815 Head Unit
2002/2003 16" C Class 7-Spoke Wheels
Updated "Chip" to fix Code 19 problem

thanks for the info guys. I had been searching for these products myself for the longest. Need to undercoat the truck that has developed rust.
My question is, if I dont want to do this myself, would the autobody or the paint shop do this for me ?
Is there a shop in NJ that someone can recommend for this who probably already have these products at their shop and will paint for me as well.
I tried going to a couple of autobody repair shops but none of them proved to be knowledgeable or helpful in this matter.

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Whether you think you can or cannot, Either way you're right!. by Henry Ford.