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#26 |
Registered User
Join Date: Jul 2015
Location: Sedalia Mo.
Posts: 1,131
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Re: Sandblasting?
I had my cab, frame, front fenders, tailgate, & doors sandblasted many years ago by a private business that typically blasted out concrete trucks. He knew what he was doing and how to set up his equipment for doing sheet metal. He refused to do the hood for fear of warpage. The rest turned out really well.
BTW, it's NOT the heat that often causes warpage. Sheetmetal will have internal stresses the come from being cold formed or pressed. The bombardment (peening) of the metal by the sand relives those stresses and that causes the metal to relax and take on a new shape or curvature. These stresses are what help keep it's form and once relieved a new form may take place. I ended up using a small pistol grip sandblast unit on my hood and about half way through I heard an oil can pop...sure enough the hood had warpage. This warpage was not small, it covered a quarter of it's surface. This small blaster would only clean a 1 inch square at a time and there was no heat that could be felt. I suppose an industrial blaster could generate enough heat in the hands of someone without any experience. Bedsides, bed front panel, cab roof, and door sides are the areas to avoid with sandblasting. Those areas are easy enough to strip with paint stripper and sand clean. If there is rust and/or pitting, I would not hesitate to sandblast with a small pistol grip gun keeping the gun at least a few inches away from the metal as the peening effect is reduced the further the gun is away. I'd have it blasted first, then get it to the shop and strip the rest. Tip: a cab rotisserie is not too hard to make and makes basting and working the cab soooo much easier. Not too mention rotating over and over along with using a compressed air wand really helps get the sand out.
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He who is without oil shall throw the first rod. Compressions 8.7:1 1972 C10 1976 C10 (parts truck) 1985 K20 |
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#27 |
Senior Member
![]() Join Date: Dec 2013
Location: Gods country East,Tn
Posts: 8,545
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Re: Sandblasting?
https://www.youtube.com/watch?v=bVFi6CMjhI8
![]() I would be very leery about sand blasting the seam sealer out of the drip rail .
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![]() 1967 Factory short bed - Old school '71 - 350 / 4bolt / 487 heads / Edelbrock C3BX Muncie M-22 4 speed / Hurst Comp plus Factory 12 bolt posi 3.73 / 255-70-15 Smoothed firewall / Factory cowl induction Power disc brakes / power steering / 3.5-5" drop Last edited by Grumpy old man; 09-08-2021 at 09:10 AM. |
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#28 | |
Member #1049
Join Date: Jun 2000
Location: Troy Montana
Posts: 3,940
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Re: Sandblasting?
Quote:
If you are seriously thinking about the dustless blasting method I would recommend you really research reviews of the pros/cons. I have heard horror stories about the residual effects of not being able to get all the imbedded soda off the metal before paint. If you are only wanting paint/bondo removal and not concerned about rust removal then I would recommend walnut shell media for blasting. (pictures attached are of one I had walnut shell blasted, you can see what was lurking under the factory paint, (the owner wanted to retain all the factory paint in the jambs). It was done by alternative blasters in Marysville. https://www.yellowbook.com/profile/a...625062021.html. The powdercoating/sandblasting place in Monroe is Thermo Tech (http://www.thermotechcoatings.com/home.html ), Zach (the owner) is a serious car guy. He also owns JB Sandblasters in Arlington. I have had lots of work done by them and highly recommend them. |
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#29 |
BlahBlahBlah
Join Date: Feb 2002
Location: Wa.
Posts: 19,866
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Re: Sandblasting?
Good info Mark. I’ve always used Alternative in the past. They changed ownership awhile back now and I feel they are less organized.
I wanted to try that place in Arlington next if nothing panned out here. It’s good to know it’s the same owner as the one here in Monroe. I stumbled across them last week-ish, never even knew they were here.
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#30 |
Senior Member
![]() Join Date: Apr 2006
Location: Yuba City, Ca
Posts: 1,945
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Re: Sandblasting?
There’s a company near me that uses plastic media to blast. Anyone heard of this? I considered using them a few years ago for my Chevelle.
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Kirk 72 Blazer CST 4wd highlander |
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#31 |
Registered User
Join Date: Apr 2017
Location: Knoxville, Tennessee
Posts: 891
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Re: Sandblasting?
Eastwood sells an interesting wet blaster, but you need a 3.5 Gpm pressure washer and seems messy. https://www.eastwood.com/liquid-media-blaster.html
I’m finding my portable air compressor is woefully inadequate for media blasting with a Harbor Freight pressure blaster. Humidity is a huge problem down here too. (Not blasting anything on the 69. Just wanting to clean up a classic motorcycle frame and other things.)
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1969 GMC K25 2007 Chevy 2500HD Classic Duramax 1999 Tahoe 2DR 4WD Base Model 5.7l |
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#32 |
Senior Member
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Location: Harrison, Arkansas
Posts: 9,815
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Re: Sandblasting?
I had the cab, doors, fenders and hood hydro blasted on the Arkansas K10. The hood was a fail, all else was good.
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other Larry Build thread, Arkansas K10 https://67-72chevytrucks.com/vboard/...=755797&page=5 The ability to speak several languages is an asset, but the ability to keep your mouth shut in any language is priceless. |
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#33 |
Special Order
![]() ![]() Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,859
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Re: Sandblasting?
Good to know. What went wrong with the hood?
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"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ |
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#34 |
Senior Member
![]() ![]() Join Date: Sep 2008
Location: Harrison, Arkansas
Posts: 9,815
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Re: Sandblasting?
He warped the hood.
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other Larry Build thread, Arkansas K10 https://67-72chevytrucks.com/vboard/...=755797&page=5 The ability to speak several languages is an asset, but the ability to keep your mouth shut in any language is priceless. |
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#35 |
Senior Member
![]() Join Date: Jan 2013
Location: 3,018 feet above the SoCal/Mojave Desert region.
Posts: 359
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Re: Sandblasting?
Had my cab, doors, and fenders media blasted. Soon the bed. The guy uses fine crushed glass. The cab isn't assembled yet, but never heard of warping. Does give the metal a rough feel. Blasting is the best way in my opinion to see everything. After having the metal blasted, more rust became visible. Now the body shop knows what their working with.
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#36 |
Registered User
Join Date: May 2013
Location: You're the only 10 I see
Posts: 367
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Re: Sandblasting?
Lots of comments in this thread about hood issues. What is the trick to not warping a hood? I need mine blasted, or else I am going to have to buy a repop.
Why would you avoid blasting the seam sealer out?
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1972 C20 |
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#37 | |
Senior Member
![]() Join Date: Dec 2013
Location: Gods country East,Tn
Posts: 8,545
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Re: Sandblasting?
Quote:
![]() Watch the stout customs videos fo a lot of good information . https://www.youtube.com/watch?v=CbuvdY0lzTg
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![]() 1967 Factory short bed - Old school '71 - 350 / 4bolt / 487 heads / Edelbrock C3BX Muncie M-22 4 speed / Hurst Comp plus Factory 12 bolt posi 3.73 / 255-70-15 Smoothed firewall / Factory cowl induction Power disc brakes / power steering / 3.5-5" drop |
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#38 |
Senior Member
![]() Join Date: Dec 2013
Location: Gods country East,Tn
Posts: 8,545
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Re: Sandblasting?
If your set on having the truck blasted just leave it all up to whoever is doing the final paint work . If you watch the Stout Customs videos you'll see the considerable amount of work required after all the metal work has been done before any actual paint is sprayed .
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![]() 1967 Factory short bed - Old school '71 - 350 / 4bolt / 487 heads / Edelbrock C3BX Muncie M-22 4 speed / Hurst Comp plus Factory 12 bolt posi 3.73 / 255-70-15 Smoothed firewall / Factory cowl induction Power disc brakes / power steering / 3.5-5" drop |
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#39 | |
Registered User
Join Date: May 2013
Location: You're the only 10 I see
Posts: 367
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Re: Sandblasting?
Quote:
I also recently took a cab down to bare metal for color change without blasting. Lots of work for sure, and I did use a small spot blaster in a lot of locations. Surface prep discs on an angle grinder, and many wire wheels did the trick for me.
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1972 C20 |
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