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Old 06-01-2000, 10:15 AM   #1
8Complex

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Post Anyone try Dry Ice to get dings out?

I've got some hail damage (some pretty good, too) but I'd like to keep as much of the insurance money for toys as possible (since they shafted me, I doubt I'll get away without having to pay to fix it, though).

I was wondering if anyone had used dry ice to remove dings. If so, how did they turn out? And where did you get the dry ice to begin with?
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Old 06-01-2000, 10:33 AM   #2
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I got $1800.00 from my insurance company a few years back for hail damage, I took the car to Dent Wizard and they only charged me $850.00 to take all the hail dings out! They did awesome work! It left $950 for toys!
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Old 06-01-2000, 10:40 AM   #3
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Hmmmmm... I guess I'll see if I can take it to a PDR place sometime for an estimate as well, though DentBusters tends to be expensive as hell ($210 for 2 small dings a few mts. ago - yeah, the irony, huh?).

Still want to hit a few with dry ice... several are so small that I really have to look for them to find them (which I might not mind leaving since I figure I'll drive the hell out of the car before I even pay it off).
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Old 06-01-2000, 11:15 AM   #4
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Keep us posted on the dry ice; I for one would really like to know how well it works. Thanx.
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Old 06-01-2000, 01:34 PM   #5
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Wow, I've never heard of using dry ice to remove dings! How does it work? And can anyone post the basics on how to use it correctly? I think I could get some dry ice from one of the labs at my school. It would be much more preferable than sending my Scoobie to the body shop. Thanks
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Old 06-01-2000, 02:17 PM   #6
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ive heard that it does work, apparently the super-cold temperature shrinks the metal back into shape, but my understanding of it was that it didn't work on significantly large dings... itd probably be a good idea for hail damage though, even if it doesn't completely remove the larger ones it might make a substantial difference as opposed to takin it to a shop
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Old 06-01-2000, 02:30 PM   #7
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Labs? Hey, I work in a place that must have 100 seperate labs... Damn, why didn't I think of that one? Thanks.
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Old 06-01-2000, 05:55 PM   #8
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8Complex
Keep us posted... I have heard of dry ice being used but I am not sure of the exact process.
And if you can't get it at work, I imagine that lab suppliers or refrigeration companies in your area have some.
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Old 06-01-2000, 05:58 PM   #9
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From what I know about it...the dry ice works like heat in that it exposes the metal to such temperatures that it is much, much easier to fix.

Gives a whole new meaning to "cold shrinking". Let me know how it works!
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Old 06-01-2000, 06:07 PM   #10
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Saw it on Shadetree Mechanic...

2 ways you can go about it...

1. Let your car sit in the hot sun(to get the metal good and hot and put an ice bag Directly over the Blemish)...

2. Take your hairdryer and heat the area of repair..Take Dry ice and apply to the freshly heated surface...

It causes such a temp "shock" to the metal that it's supposed to "Pop" the ding back out...

Not reccomended for dings with the paint broken...or DEEP holes..

just your normal "mild" door ding...or hail damage..

Havn't had to try it yet...but couldn't hurt....Good luck

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Old 06-01-2000, 06:10 PM   #11
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The one problem I hear about w/regards to the hairdryer/"instant shrink" method is that you do get a ripple effect in the ding.

I have never seen a car repaired this way. But body shops don't use this sort of thing, and considering the shortcuts some of them use I would be surprised if it were completely flawless. Maybe it's just impractical for the damage they have to repair.
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Old 06-01-2000, 06:43 PM   #12
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dry ice huh...
I've got two little "door" dings that sound perfect for this...

When I get back from NY I'll give it a try and take pics so you guys can judge for yourself.
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Old 06-01-2000, 07:27 PM   #13
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Yeah now all I have to do is find a place that sells it.

I've heard Baskin Robbins does, though somehow I doubt they just give it to you in a bowl or something. "Here, have some dry ice on a sugar cone!"

I've got some good gloves for handling it so no worries there. I've got a few minor dings (that I could probably pop out with a wooden spoon from the opposite side if I could get to them (roof)) but I think I'll have to try it out on a few of the tougher ones on the hood.

Well, time shall tell. I will take before and after pics using the old flourescent light trick to get a line of light around the ding before and after, as well.
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Old 06-01-2000, 07:55 PM   #14
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If you have a commercial ICE HOUSE they will have it. If you live on the coast look for a fishery thingy and they will have it.
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Old 06-01-2000, 08:00 PM   #15
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Dry ice has been harder to get a hold of lately, due to the fact that it is a primary ingredient in certain types of bombs...

Who knew the power of frozen CO2?
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Old 06-01-2000, 08:54 PM   #16
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How about this....

Heat it up with a hair dryer...

Then Spray it with CO2 fire extenuisher...

Same Effect...No??????
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Old 06-01-2000, 09:02 PM   #17
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Revision - Bomb? What bomb? I was just trying to take out the dings because of the hail... uhhh, yeah. Ok, I gotta go now.

Scooby South - ROFL I can see it now... Car washes converted to Ding Removal Centers. Just drive on through and you're free of all door dings!
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Old 06-01-2000, 10:44 PM   #18
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How many dings do you think you can do in one area? I've got a couple dozen ding.


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Old 06-02-2000, 04:06 AM   #19
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Hmm..
I play paintball..
some of my guns use C02.. While the CO2 is in the Cylinder it is liquid...

Could I just invert one of my tanks and hit the ding with some liquid c02 and achieve the same effect as dry ice.

I don't know where to get dry ice around here... but c02 I've got.
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Old 06-02-2000, 05:27 AM   #20
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Oh the irony, fixing damage caused by ice (hail) with ice. I guess it's like fighting fire with fire.

As an alternative to dry ice, I wonder if "Freez-it" spray will work? I need to check on its primary ingredient 1,1,1,2-tetrafluoroethane, and what it may or may not do to the paint. Since I have some of the stuff at work, I might try spraying a shot on an inconspicuous area under my bonnet. Also, "Freez-it" spray can cool things down to about -60 F. Such a drastic drop could crack the paint. Anybody recall how cold Dry ice is? How about liquid CO2 as it changes to vapor, as Fishguy suggested? I'm guessing CO2 maybe safer, less chance it will attack the clearcoat or paint. I guess I should stop typing now and start flipping through the reference books.

Ok, an update. Dry ice is -109.3 F. From what I could find so far, "Freez-it" spray (1,1,1,2-tetrafluoroethane) is relatively inert.

[This message has been edited by Scooter (edited June 02, 2000).]

Well, I just tried a couple experiments. I put some small dings in the thinnest sheet metal stock I had available (.020-.025"). I heated up a large area around the ding first, then blasted the ding with some freeze spray. Unfortunately, this didn't seem to have any effect. I might have been using too thick of sheet metal for this to work, or the freeze spray just doesn't get things cold enough fast enough to work.



[This message has been edited by Scooter (edited June 02, 2000).]
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Old 06-02-2000, 09:03 AM   #21
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Fishguy - Co2 is NEVER liquid - it phases from solid to gas directly - Don't ask me how. That's the "dry" in dry ice.

-Ohhh, the mysteries of life...
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Old 06-02-2000, 09:17 AM   #22
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Found some interesting stuff about dry ice and a few experiements. I've gotta make a few calls and see who sells it since I don't think there are "ice houses" around here. The fishing situation in Lake Michigan is rather small, I believe. Maybe on the Michigan side it is larger but around Chicago, I doubt it exists.
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Old 06-02-2000, 09:17 AM   #23
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You are correct. CO2 transitions directly from solid to gaseous form. This process is called "sublimation." The molecular structure of C02 prevents a liquid state from being viable. A neat trick- put the back of a metal spoon against a chunk of dry ice. The spoon will scream.
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Old 06-02-2000, 09:30 AM   #24
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If dry ice is what you are looking for try your local grocery store. They have it in the meats department. If you catch them right after a delivery they normally have tons of the stuff and are willing to give it away. Or you could get some mail order steaks. They use dry ice for that. If it was me I'd got to the chem lab and get some liquid nitrogen. Just a thought...
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Old 06-02-2000, 10:13 AM   #25
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Off a Liquid Nitrogen FAQ - "Liquid Nitrogen is chilled, condensed gaseous nitrogen. It is also colorless, odorless, non-flammable, and non-toxic. It is also extremely cold (LN2 boils at -324 F or -210 C)"

WOW! Talk about cold. I have a feeling that'd crack the hell out of the paint or ruin the clear coat, though.

Anyone know what the paint/clearcoat can handle in the way of temperatures?
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