Posted by JRSutton on August 16, 2011 at 05:58:31 from (75.130.109.233):
In Reply to: Dent removal posted by Craig45 on August 16, 2011 at 05:37:36:
dents can be removed by shrinking the metal.
heat the spot red hot with a torch, then put the ice on it to instantly cool it. That will shrink the metal in that area faster than the surrounding area - and the metal will sort of "freeze" that way as it cools.
Repeat till the dent is gone.
Obviously if you're using a torch on a gas tank you want to be careful there are no fumes in it.
You don't need dry ice for that - and it could be there's some other process using dry ice that I don't know about - but on the other hand it's the temperature extremes that does the shrinking, so dry ice should work faster - with less mess.
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