On 12/16/2012 05:39 PM, healeys-request@autox.team.net wrote:
http://www.rickswoodshopcreations.com/miscellaneous/rust_removal.htm
> Message: 7
> Date: Sun, 16 Dec 2012 15:57:53 -0500
> From: "Peter Svilans"<peter.svilans@rogers.com>
> To:<healeys@autox.team.net>
> Subject: [Healeys] Dipping vs Blasting
> Message-ID: <B338C4E3BCFD462B905E4CE3F989904D@9535DEE118EC44B>
> Content-Type: text/plain; charset="us-ascii"
>
> Chemical stripping costs more but overall you get a more thorough job of
> rust-removal. Immersing a rusty chassis in a fluid means the chemical flows
> into and through all the spot-welded flanges (well, mostly), and closed box
> sections.
>
> Media blasting only cleans off the areas to which there is direct line-of
> sight access. You won't get the operative, who's thinking about lunch,
> clambering in and out of your chassis with his blast hose just to get at those
> inaccessible nooks and crannies.
>
> Many offer a prime-and-paint service, and once the chassis is in shiny paint,
> those rusty corners and flanges are out of sight out of mind. At any rate, our
> modern primers will keep the rust at bay until the warranty runs out, right ?
>
> No, the chemical dip is not perfect. The better companies stand the chassis on
> end and flush the insides with a neutralizer or water from a running hose for
> several hours or overnight. But there is still a chance of those orange
> cauliflowers appearing in unexpected places. But the metal guys prefer to work
> with clean metal, and not spend a lot of time opening up and hand-grinding
> rusty spotweld flanges. And the industry's operatives themselves aren't
> necessarily NASA material either. One of our bodies was left in the tank
> overnight, invisible, and the night shift dropped another car on top of it,
> crushing the roof.
>
> Dip strip places are fast disappearing, being chased out of town by the
> environmental brigade. Lots of beaurocracy. Our stripper had a wall covered
> with government inspection certificates. Even the chemicals themselves are
> less effective, the bio-based materials being less agressive than before. The
> dip-strippers are fighting an uphill battle, and along with the plating
> houses, won't be around next generation.
>
> Best regards
> Peter
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