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Kezzie
Samba Member
Joined: March 10, 2015
Posts: 2
Location: Rancho Cucamonga
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 Posted: Wed Apr 01, 2015 8:23 am Post subject: Media Blasting my 63 |
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| Hello fellow VW lovers...Was wondering if any of you can shed some advice possibly from your own experiences or knowledge. I am getting ready to have my 63 Bug media blasted and my question is...Do I have to have the car primed right after or can the vehicle sit in my garage for a little while I come up with all the funds for the paint and body work? Thank you in advance for all the insight! |
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Eric&Barb
Samba Member
Joined: September 19, 2004
Posts: 24765
Location: Olympia Wash Rinse & Repeat
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| Posted: Wed Apr 01, 2015 9:09 am Post subject: |
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Be very very careful!
Way too many stories here about media blasting that ends up warping body panels due to blaster using way too high of air pressure.
These VWs are made of steel that rusts as soon as the metal is exposed to oxygen, and there is about 18% of that in the air about you. So best to derust and epoxy primer as fast as possible. Cheap primers are not gas tight as epoxy primer, so even when coated with the cheap primer in just a few weeks the rust can take hold right thru it.
You should take a gander and ask this question in the "Body/Paint" forum. For some reason they have tons of body and paint info there. 
Good that you are asking the questions you have. Better to take lots of time in research than to have to take a lot more time fixing or giving up on the problem caused.....
The moderator can move this post there for you...
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c21darrel
Samba Member
Joined: January 22, 2009
Posts: 8211
Location: San Dimas
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Kezzie
Samba Member
Joined: March 10, 2015
Posts: 2
Location: Rancho Cucamonga
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| Posted: Thu Apr 02, 2015 1:45 pm Post subject: |
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| Thank you Eric&Barb and c21darrel for all the great insight. You information is very helpful and much appreciated. |
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wcfvw69 
Samba Purist
Joined: June 10, 2004
Posts: 13389
Location: Arizona
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| Posted: Thu Apr 02, 2015 3:40 pm Post subject: |
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I had my 69 bug convertible shell sand blasted and boy did they ever warp every panel on it. I was NOT HAPPY and made him lower his price down significantly when I saw the damage he did.
You're best bet is to call around to various places near you. Ask what they use for media. Share your concern with NOT wanting any panels warped. See what they say and if they sound like they know what the are doing.
I'd also ask around at restoration shops near you. Ask who they use.
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danny gabbard
Samba Member
Joined: September 08, 2008
Posts: 588
Location: carson city. Nevada
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| Posted: Thu Apr 02, 2015 11:50 pm Post subject: |
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Use chemical stripper on all flat areas and blast all edges . Only use walnut or plastic for the media
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theKbStockpiler
Samba Member
Joined: July 07, 2012
Posts: 2316
Location: Rust Belt
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| Posted: Fri Apr 03, 2015 10:56 am Post subject: |
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Playsand with a siphon blaster at 90psi does not warp panels. I have done it many times with sheet metal. 
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My beetle is not competing with your beetle. I have the yellow beetle in my town. There is a red one, a green one ......
Use all safety devices including a mask. |
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c21darrel
Samba Member
Joined: January 22, 2009
Posts: 8211
Location: San Dimas
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theKbStockpiler
Samba Member
Joined: July 07, 2012
Posts: 2316
Location: Rust Belt
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| Posted: Fri Apr 03, 2015 12:05 pm Post subject: |
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I had never heard of warping a panel until recently and I have blasted many thin and rusted panels. I searched the web for it after cautioned in this forum and it was news to me.
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My beetle is not competing with your beetle. I have the yellow beetle in my town. There is a red one, a green one ......
Use all safety devices including a mask. |
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Air-Cooled Head
Samba Member
Joined: October 15, 2002
Posts: 4070
Location: Chicago Suburbs
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| Posted: Fri Apr 03, 2015 1:15 pm Post subject: |
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| c21darrel wrote: |
| Ive never warped a panel using sand either. Maybe the big, high pressure machines are to blame. |
Yep. That, and a lack of experience with it.
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danny gabbard
Samba Member
Joined: September 08, 2008
Posts: 588
Location: carson city. Nevada
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| Posted: Fri Apr 03, 2015 3:49 pm Post subject: |
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Anytime you leave marks in the metal , You are stretching the metal ! The more marks , The more stretching . Use soft media like walnut shell , Plastic , bakeing soda and reduce chance's . Plus use'n sand shot peens metal and makes it very hard ! And doing metal finishing with NO filler makes the work twice as hard ! Your file does not cut and you cannot file flat
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Shipping is NOT included in any of my products or parts. Just want to say thanks from GAB-FAB for any purchase!! |
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theKbStockpiler
Samba Member
Joined: July 07, 2012
Posts: 2316
Location: Rust Belt
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| Posted: Fri Apr 03, 2015 4:50 pm Post subject: |
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That's a great indication if you are stretching the metal but you are supposed to be aiming the nozzle at rust. Sandblasting a clean piece of steel seems like a waste of time. 
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My beetle is not competing with your beetle. I have the yellow beetle in my town. There is a red one, a green one ......
Use all safety devices including a mask. |
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danny gabbard
Samba Member
Joined: September 08, 2008
Posts: 588
Location: carson city. Nevada
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| Posted: Fri Apr 03, 2015 7:41 pm Post subject: |
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I would rather take my time and strip a outer skin with chemical/paint stripper and be able to metal finish . Use chemical/metalprep to desolve your rust issue and let the blaster just do detail cleaning . Blasting crusty rust tends to make your metal disappear and have pinholes. or if its that bad , cut it off in the beginning and get the metal cleaned up behind for the patch panel replacement. I mostly blast jams , inner structure, rain gutters , window frames and hard to get to places. My old blaster used a combo of about 90% walnut and about 10 % glass bead. worked bitchen !
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Shipping is NOT included in any of my products or parts. Just want to say thanks from GAB-FAB for any purchase!! |
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54ovsemi
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Joined: April 15, 2008
Posts: 1818
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CiderGuy
Samba Member
Joined: December 23, 2013
Posts: 1351
Location: Bucks County, Pa
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| Posted: Tue Apr 07, 2015 9:50 am Post subject: |
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I've use the green colored 4-1/2 in. Polycarbide Abrasive Wheel from Harbor freight to remove paint from the Ghia I been restoring, and it removed the paint like a hot knife cutting through butter. I was very impressed with how quickly the wheel worked on a 4.5 grinder. They do wear down fairly fast, but at $4.99 when not on "sale" so what?
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phil fox
Samba Member
Joined: March 07, 2002
Posts: 110
Location: Santa Rosa, CA
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| Posted: Wed Apr 15, 2015 10:02 pm Post subject: |
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| I used to run a Media blasting shop here in Nor-Cal, and have done hundreds of cars.. including a few VW's.. As long as you get someone who knows what they are doing then you should have NO problems... As for some people suggesting to use "play sand" and abrasive media from harbor freight... I strongly disagree... it will warp body panels QUICK if you don't know what you are doing... I used to use a couple different grades of aluminum oxide (comes in different "grit" levels just like sand paper) but that is ONLY for the jams and corners of bodies... For the panels (doors, fenders, hoods, etc) I used a crushed acrylic (plexi glass powder basically) with lower pressure.. The downfall to that OR softer abrasives like walnut shell, is that is does not cut through rust a ton.. It is mostly for paint and filler removal.. But it will not get hot and warp or stretch panels... Hope that helps... |
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jpjohns
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Joined: May 03, 2014
Posts: 882
Location: Harrisonburg, VA
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| Posted: Thu Apr 16, 2015 9:12 am Post subject: |
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You could find a "dustless" or wet blaster, then you wouldn't have to worry about warping.
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"Scrapyards are for quitters" - Beetlenut (a Samba member) |
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Chad M
Samba Member
Joined: July 14, 2003
Posts: 723
Location: Alberta
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| Posted: Thu Apr 16, 2015 11:16 am Post subject: |
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| jpjohns wrote: |
| You could find a "dustless" or wet blaster, then you wouldn't have to worry about warping. |
Its about profiling the metal that causes the warping, not necessarily the heat associated to the blasting. |
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