Clipped from an Alfa Romeo Bulletin Board (http://www.alfabb.com) that I frequent - I saw this and thought it might be of use here:

Dry - Ice Blasting to remove undercoating

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I saw this a year or so ago in German Classic Car magazines - and was wondering if any of you have any experience with it or know of any companies here in the US (California)?

The results are quite amazing and the magazine tests and reviews are very positive. It sure saves tons of work, dust and dirt and your car is clean like new from underneath.....

http://www.carblast.de/

(click on "Beispiele" - samples - and check out the different cars - especially the Duetto with 3 coats of undercoating)

http://www.trockeneis-reinigung.com/

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Anyone here ever heard/tried this technique? I mentioned that the discussion of using dry ice to remove floorpan matting has come up here before, but this is the first I'd ever heard of using dry ice as a blast media.

I understand the principle I think, but I've never heard of it.

Ice Tech

Interesting technique ...

It's been around for a while. The biggest attraction is environmental, no used media disposal problems.

First saw it used ten years ago during aircraft repaint. Dry ice only posses one problem it depleates the oxygen in the area

I used a propane torch with a wide tip to warm under coating. Scrape it off with a putty knife (use an old low oil drain pan to collect the soft tar), and then wipe the small remains off with rag soaked in lacquer thinner (have plenty of ventilation, and wait to use rag AFTER turning off torch!!!)

I did the dry ice technique on the trunk area of my z to get off the tap paper. I guess if you had your Z on a rotisserie you could turn it upside down and just put dry ice on the undercoating as I did in the trunk of mine. This seems more feasible for the every day joe. It would work wouldn't it? Maybe not be as effective and dry ice blasting, but good non-the-less.

I used a heat gun with a wooden scraper. The metal putty knife scratched the primer-coat. Then some wiping with solvent.

I used the propane torch methos on my race car project. It worked awesome, I stripped the bottom of the car to bare metal with the torch heat and a metal scraper...