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Old 12-16-2012, 06:24 PM   #1
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Default Remove Undercoating and Seam Sealer

I am in the process of removing the undercoating and as much seam sealer as I can. I have been working on it for quite a long time, and am getting to the point that I will have to pull the subframes and fuel tank to get all of it.

I have weighed only a portion of what I have removed, and have officially confirmed at least 10 pounds. I have almost 4 pounds of seam sealer alone. I would estimate that I have actually pulled at least 15 pounds total. I wish I would have collected all of the material from the beginning to get a real accurate measure.

Some of the material was not possible to collect due to removing some of it with a drill driven brush, much of which is lodged in my eyeballs.

Has anyone here gone through a total undercoat strip? Any suggestions on the best way to get it clean economically and relatively swift?
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Old 12-16-2012, 09:19 PM   #2
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From the 949racing blog post about the shell they dipped for Crusher:


"Just got the enduro tub back from Strip Clean in Santa Ana, CA. Was 495 lbs, now 461 lbs."

So they got 34 lbs out of an acid dip. Id say the 80/20 rule would apply here? Maybe 27.2lbs would be removable by tool/dry ice? I'd say 15lbs is a great start without pulling subs.
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Old 12-17-2012, 04:37 AM   #3
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Hi,

I used :

- trowel
- sand paper
- drill driven brush
- paint burner (lot of "bad smoke")

It was the first time for me. I'm not a pro, but if you do the job, I would advice you to use goggle and a dust mask. And be sure you work in safety.


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Old 12-17-2012, 06:20 AM   #4
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8in wire wheel on a 8in grinder. Hold on tight and wear gloves and safety glasses. Finish up tight areas with decreasingly smaller wheels and tools. Wipe clean with laquer thinner or acetone.
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Old 12-17-2012, 09:54 AM   #5
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I need to try the larger size brush. I have been using the brush that sticks straight out. I have a little wheel brush, but it cut in to the metal too much. Perhaps I need one with a softer brush.

I spent a lot of time scraping, and found the best results with wood chisels of various sizes. To get the dynomat material in the drain locations on the floor, on the firewall, and in the trunk, I used a heat gun to soften it followed by a scraper and clean up with WD-40.

I am doing a lot of the detail with steel wool and WD-40 underneath. I think I would like to try some Scothbrite pads.
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Old 12-18-2012, 07:41 PM   #6
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Have u guys tried dry ice for the sound deadening in the boot? A lot easier than scrapping it off.
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Old 12-19-2012, 12:30 AM   #7
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Dry Ice Blast Cleaning | Dry Ice Blasting

it is used in aviation to remove sealant without damaging the aluminum surface. might be costly, but it never hurts to ask for a quote.
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Old 12-19-2012, 01:54 AM   #8
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I think he means to freeze it and crack it off. Not sure its thick enough but worth a shot.

A big, soft wire wheel should be nice. The ferris wheel type not the cup type.
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Old 12-19-2012, 03:54 AM   #9
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I had good luck using a puddy knife I sharpened on a grinder. I had mine down to a bare tub and removed
around 18 lbs.
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Old 12-20-2012, 06:28 PM   #10
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Quote:
Originally Posted by jacob300zx View Post
I had good luck using a puddy knife I sharpened on a grinder. I had mine down to a bare tub and removed
around 18 lbs.
Jake how long did that take you?
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Old 12-20-2012, 07:08 PM   #11
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Cleaning the bottom of my car I used a wire wheel on an angle grinder and a sand blaster (less effective on undercoating) along with the usual hand tools (wire brush, putty knife, flat screwdriver etc).

I was doing it to remove rust and then paint / re undercoat so I wasn't as fastidious about removal of every last little gram.

Sand blasting made a mess (you will have sand coming out of places days after despite full hazmat suit and mask) and can be frustrating unless your compressor is large. It worked great if you used it in conjunction with a scraper to give it a notch in the material to work with.
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Old 12-20-2012, 07:30 PM   #12
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Just did the interior of a 99 for a spec build. Sound deadner off the floor, tunnel, and firewall in less than an hour. Used the torch/scraper method. Finished with 8in wire wheel and lacquer thinner. Easy.
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Old 12-20-2012, 09:06 PM   #13
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Quote:
Originally Posted by ZX-Tex View Post
Jake how long did that take you?
About 8 hours.
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Old 12-28-2012, 11:47 PM   #14
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18 lbs? Does not seem like there is that much there in my NB. It is completely gutted right now, about to get a cage install.
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