A project that kept me busy for the last few months was to bring back our "new" Roadmaster to its former glory. The car has only 23k miles on the odometer and in many areas still looked like new. The undercarriage was not protected very well from the factory and like on all cars had developed some surface rust over the last 2 decades although the car never was stored outside nor regularly driven in the rain. It also never saw road salt or snow during its entire life. Below are some before pictures where you can see the fantastic condition the car was in before I started cleaning it up.

All the original factory markings were still in place
I decided to make sure that all the rust was gone and that I wanted to give it a new undercoating to protect it as best as possible should I ever encounter wet roads.

The first step was to have the undercarriage dry ice cleaned. During this process all the old undercoating gets removed completely and even most of the old paint was removed from the frame.
You can see the result of this process in the video below - it shows the car right after the first clean up - before painting and removing some more surface rust:

After that I chemically removed all the remaining surface rust completely with rust removing gel which leaves only perfectly clean and rust free metal behind.

The new and the old Roadmaster together

The next step was to make sure that the metal was 100% clean for the paint to stick perfectly. I used "Marine Clean" and "Metal Ready" to prep the bare metal after I had wiped everything with acetone multiple times until all rags stayed clean after wiping.

For the repaint of the undercarriage I wanted to make sure to use a paint that would be able to prevent rust and chipping. After a lot of research I found a company called "Timemax" which produces some fantastic rust preventive paint and special undercoating products. They won some long term tests in a classic car magazine. Their products are also used on ships.

I bought their undercoating paint and sprayed three coats onto the undercarriage and frame. In the wheelhousings I also applied two coats of their rock hard stone guard which I had already used on my 74 as well.

Some of the Timemax products which I used.

The first coat of fresh paint.

The undercarriage after the repaint. The exhaust system is still the original one installed by the factory and the only part left with some corrosion.

After I had finished the undercarriage, I sprayed a special hot wax into all the cavities of the undercarriage and the rest of the car. Now there is no chance for rust to form anywhere ever.
Afterwards I cleaned and detailed the rest of the car.
The paint got a full compounding where I could remove all the scratches and swirls and afterwards I polished the car to perfection and sealed the paint with 3 coats of a highly praised ceramic coating by "Carpro" called "CQuartz UK 3.0"
I also fully cleaned all the rims and sealed them too and installed white wall tires from my old Roadmaster which are only 2 years old. I also removed the spoiler the previous owner installed to the rear window and changed the brake fluid and oil.

The car is back on its feet with "new" tires installed.

All that is left now is to get the dents out on the rear quarter panel, and repaint the rear bumper. After that the car should again look like it just left the factory. I wanted a nice driver, but as it turns out the car will be in show quality condition once I'm finished, and I will have a hard time driving it, as it will be so perfect…

Tags:Underbody, Undercarriage, Undercoating, Video, Undercoating Removal, Restoration, 1996, Buick, Roadmaster, Dry Ice Blasting, Dry Ice Cleaning