Paint/Body Corvette Materials, Techniques, and How To

media blasting.

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Old Sep 12, 2007 | 11:10 PM
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Default media blasting.

What type of media is used on a Vette? Also anyone have an idea of the cost of having it done? I have a family member with a sandblaster but I'm not letting him loose on it till I get some facts. The second question (cost) was due to the fact that I dont really think I will let him do it anyway. Cant hold him liable for any damages.

Last edited by rayluka; Sep 12, 2007 at 11:10 PM. Reason: sp
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Old Sep 13, 2007 | 07:06 AM
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you use soda for blasting fiberglass .i had mine shoot last year fo about 400.00.and you can leave the chrome on your car
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Old Sep 13, 2007 | 08:27 AM
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Thanks. I am surprised its so inexpensive. I hear a lot of stories about the razor blade and chemical stuff being so much labor.
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Old Sep 13, 2007 | 01:22 PM
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Some feel that soda blasting, while effective, also gets everywhere and can contaminate your paint job later. SPI says in their catalog not to use their paint after soda blasting; I didn't ask them why. You might check with them or some other paint companies for their suggestions. I just finished stripping my '86 with razors and a cheap DA. A good bit of work, but not too bad. Big panels; doors, hood, etc, go quickly. Time consumeing with the details and tight curves; nose and tail pieces for instance. While I have prepped a couple of cars, this is my first time stripping and painting, so I'm no expert.

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Old Sep 13, 2007 | 01:29 PM
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i use type 6 acrylic on vettes. soda blasting is sodium bicarbonate , use at your own risk. i will not accept a car that is soda blasted. many paint companies will not warranty over it. good luck with it.
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Old Sep 13, 2007 | 01:46 PM
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I had some stuff done with acyrlic beads and I was very impressed. They were even able to leave on a very thin layer of factory primer. Sand and fiberglass to not play well together, I don't care if someone says they'll use 70 grit, it still chews up the fibers.
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Old Sep 13, 2007 | 02:28 PM
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type6 acrylic is the softest media for fiberglass. leaving a thin coat of substrate is the way it should be done. i do not trust anything else on glass.
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Old Sep 13, 2007 | 04:27 PM
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you can paint any car with any mfg paint anytime as long as the guy that blast your car and neutralizes it. my car was stripped down to the frame and then blasted. so no place for soda to hide. i think a lot of it is just here-say
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Old Sep 13, 2007 | 05:46 PM
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no not hear say. spi will not warranty any of it's products over soda , as stated on their web site and on their tech sheets. ppg and dupont do not want to even answer the question.
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Old Sep 14, 2007 | 07:47 AM
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ppg and dupont are used eveyday to repaint cars that have been blasted
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Old Sep 14, 2007 | 09:07 AM
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all i can tell you is if you do it and have a problem do not mention soda blasting . swear it was done some other way. i have a blasting business and wont even consider soda. it's the " what if " factor that scares me.
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Old Sep 15, 2007 | 12:23 AM
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Originally Posted by porchdog
no not hear say. spi will not warranty any of it's products over soda , as stated on their web site and on their tech sheets. ppg and dupont do not want to even answer the question.
Wow, I didn't know that.
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Old Sep 15, 2007 | 07:41 AM
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you will find a warning on the tech sheet for spi epoxy. it states to never use spi epoxy over soda. it comes back to the "what if " factor . if you have a problem it will not show up for a while and the fix will be going back to metal or glass and starting over. thats a risk i'd rather not take. your paint shop is not going to get involved unless they are the ones who had it blasted . just food for thought.
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Old Oct 11, 2007 | 09:49 PM
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Originally Posted by porchdog
type6 acrylic is the softest media for fiberglass. leaving a thin coat of substrate is the way it should be done. i do not trust anything else on glass.
Can you give more details on the type 6 acrylic? I need to get my '68 blasted soon and would like to know what to ask the blasting biz about what they use.

Thanks!
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Old Oct 11, 2007 | 10:13 PM
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Why do you strip with a Razor or Soda?

I understand getting down to a good substrate to paint, but isn't the original Primer good enough?
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Old Oct 11, 2007 | 11:10 PM
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Originally Posted by corvetteterry
you can paint any car with any mfg paint anytime as long as the guy that blast your car and neutralizes it. my car was stripped down to the frame and then blasted. so no place for soda to hide. i think a lot of it is just here-say
He's right!!!! I own a Soda Blasting company here in Denver and most of my cliental are auto body shops... And yes you can neutralize the car before painting and you will never have any problems. Keep in mind that the Soda has a ph of 8.2 and again as long as a proper neutralization task is performed, paint adhesion will never be a problem.. Another good product is called Super K (Potassium Sulphate) This product works faster then soda and it will not create heat build up, pit, score or warp any metal, and has a neutral pH level.

I’ve used both products along with other medias in my business and in my 10 years I’ve never heard of Soda blasting being more harmful then good. Good luck with what ever decision you make just know the facts before making a final decision.
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Old Oct 12, 2007 | 07:58 AM
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if you think it is hear say you need to do some checking . southern polyurethanes inc will not warranty over soda. it is stated on their web page and on their tech sheet. you might want to check with your paint rep and ask them if it will void warranty.

http://www.southernpolyurethanes.com...y%20Primer.htm

Last edited by porchdog; Oct 12, 2007 at 08:03 AM.
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Old Oct 12, 2007 | 01:00 PM
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Originally Posted by porchdog
if you think it is hear say you need to do some checking . southern polyurethanes inc will not warranty over soda. it is stated on their web page and on their tech sheet. you might want to check with your paint rep and ask them if it will void warranty.

http://www.southernpolyurethanes.com...y%20Primer.htm
So I took the time last night to explore and research the product line by Southern Polyurethanes, and yes I saw where they say that they don’t warranty over Soda blasted cars, but again my question is why? What are the technical reasons behind this, where are the case studies and pictures showing what happens if.. I searched DuPont’s website, House of Colors and others that I could think of and none of them apparently have a problem with it. What makes SPI so special? Again I’m not trying to be difficult but for my own personal knowledge and the future knowledge of others, I would like to know why?

Last edited by ls1569; Oct 12, 2007 at 01:02 PM.
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Old Oct 12, 2007 | 02:27 PM
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Try calling PPGs tech center, no to soda! As you know, soda blasting leaves a film on the surface that needs to be completely removed. Too many cases of people not being aware of this, and not washing the panels in hot soapy water to neutralize and remove the soda. I'm not speaking for BarryK, but he has said on the SPI forum, he won't warranty epoxy on soda blasted panels because he does not sell any soda neutralizing products. There have been multiple reports from resto shops for paint failing regardless of manufacturer (PPG, DuPont, SW etc) due to improper prep of soda blasted panels.
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Old Oct 12, 2007 | 02:48 PM
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could you afford a 10k hickey ? i have been at this for over 35 years. i've tried just about everything that has come down the pike. dipping......... works great ! BUT there could be a problem . chem strip....works great BUT there could be a problem. soda blast........ works great BUT there could be a problem. it comes down to the "what if" factor. if you soda blast and have a problem you will be going back to square one and starting over. i simply will not chance this. period. on a metal car you soda blast and then have to rinse with water , going to have surface rust all over again. plus it does nothing to get rid of rust. if you have one soda blasted i would ask for a written warranty against paint failures. jmho

i really wish the problem wasn't there. if it had served my purpose it would have been cheaper. for plastic media i had to build a building and a recovery booth. really dont have a good answer for you.

Last edited by porchdog; Oct 12, 2007 at 03:16 PM.
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