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Author Topic: Sandblasting undercarriage  (Read 2819 times)
DC_1
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« on: August 24, 2005, 08:35:20 AM »

I am planning on sandblasting the underside of my car but i am wondering if I will need to strip the undercoating off first. Or will the sandblasting remove it? I plan on bringing it somewhere to have it done professionally( only cause I don't want the mess)
I got a price of $1500 CAD = 1250 USD to soda blast all body panels and sand blast the underside and epoxy prime the car after. This is provided I bring the car mounted to a rotisserie. Is this a reasonable price? Anything I should be keeping in mind from those of you that have done this?

Thanks as always

DC
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41husk
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« Reply #1 on: August 24, 2005, 09:30:45 AM »

That seems to be in the nieghborhood, I was qouted $800 a couple of years ago for my Challenger but I just needed drive train and interior removed upon delivery.  Unfortunetly that place is in Pocahontas IL, a little fur from Cannada.
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PocketThunder
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« Reply #2 on: August 24, 2005, 11:31:36 AM »

sandblasting the undercoating will take forever and a day to get it all off.  the undercoating is so brittle now that it should chip off with a small hammer and chissel.  Then the blasters will have a whole lot easier time with the underside. ..but if its the same price either way then let them do it....
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« Reply #3 on: August 24, 2005, 01:23:16 PM »

A guy at my body shop told me that media will not remove undercoating. FWIW
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Silver R/T
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« Reply #4 on: August 24, 2005, 07:56:18 PM »

depends on media, rough sand will remove most anything, removes bondo easily, why wouldnt it remove undercoating
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Troy
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« Reply #5 on: August 24, 2005, 10:14:55 PM »

depends on media, rough sand will remove most anything, removes bondo easily, why wouldnt it remove undercoating

It's rubber... Undecided (Ok, tar but it still bounces the stuff back at you.)

Sydmoe: the places I've talked to tell me that they have some "stuff" that will basically liquefy the undercoating and it falls right off. They told me to just deliver it "as is" and they'd take care of the undercoating. If you are really bored and a glutton for punishment, you can do it yourself with a torch and a scraper. The torch will soften the undercoating initially but it's messy so if you leave the heat on it longer it hardens and you can chip it off. Be careful because you can catch it on fire! I think the price is reasonable - I was quoted $700 to plastic bead blast the shell plus $80 for each additional panel (doors, hood, trunk, fenders) and they weren't going to prime anything. My total cost would be about the same but it would be more work on my part.

Troy
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« Reply #6 on: August 24, 2005, 10:23:07 PM »

torch works too, its gonna stink and burn for while though
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DC_1
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« Reply #7 on: August 25, 2005, 05:56:53 AM »

thanks guys.....I am picking up a buddies rotisserie this weekend and hopefully I can have the car stripped down to the shell by next weekend so I can mount it, spin it, and start scrapin! The blaster quoted me a price over the phone but he never said anything about me having to stip the undercoating but I can see how it would be a tough job for a blaster because as you say it absorb the impact of the media most likely. I guess I could call him but I am sure if it takes him longer than expected it will increase my price so I may as well do as much as I can on my own.

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« Reply #8 on: August 25, 2005, 09:14:15 AM »

Just use a torch and a putty knife and work it slow.  A good trick is to have someone work the torch while you do the scraping and it goes much faster.  Try not to get the metal too hot to avoid warpage.
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