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Old 07-10-2014, 02:15 PM
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Rust Inhibitors

I have been doing a lot of reading up on rust inhibitors but have not found anything specifically addressing rust in inaccessable voids. The car I'm restoring (Porsche 914) has many strutural sections made up of multi layered sheet metal spot welded together. I have found rust starting to form between the layers of spot welded sheet metal and inside the spot welded seam.

I would like to address this condition by forcing a rust inhibitor between the spot welded layers of sheet metal but I'm concerned that acids in these products if not neutralized will introduce a new problem, acid erossion of sheet metal.

Are there products designed to be injected into tight spaces, stop rust and protect long term without needing to be neutralized?

Thanks for your input

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Old 07-10-2014, 04:08 PM
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maybe some photos may prompt a response
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Old 07-10-2014, 05:41 PM
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Corroseal Rust Converter | Application Guide | How to apply Corroseal

Sometimes you just gotta do what you gotta do.. I use this for those hard to get to places.. I use a sprayer with a long wand on it to reach up into those areas and just let the excess drain out.. About the best I know of to do with things like door posts and rockers..

Sam
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I have tried most all of it and now do what is known to work..
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Old 07-10-2014, 08:54 PM
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The only way to cure this problem is to separate the two pieces of metal. There is nothing that will penetrate between two spot welded pieces of steel. Once you've separated the metal or cut it out, and acidic rust remover will clean it up. You could use calcium sulfonate paste in these seams before closing them back up.Phosphoric acid solutions will not eat up the metal You could use zinc weld thru Primer You can also use a rust encapsulator Primer.
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Old 07-11-2014, 07:06 AM
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sand blast ,ospho,epoxy prime and seam seal ,then undercoat...
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Old 07-24-2014, 01:08 AM
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I've wondered for years about treating between layers of metal and areas that aren't thought of. Where the roof skin meets the structure, between outer wheelhouses and quarterpanels, inside unibody "framerails".... anywhere that's not usually considered when doing bodywork/paint.
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