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  #1  
Old 02-14-2008, 10:21 PM
sml sml is offline
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Join Date: Feb 2008
Posts: 9
Default is "Flash Rust" a real threat?

As I mentioned a few weeks ago, I am starting a resto/tribute on my 67 911. I have disassembled most of it (bumpers, trim, chrome, etc...) and am about to chemically remove the paint and primer. I saw an article about flash rust appearing on metal once the paint is removed. The article said one has roughly 5 minutes to protect the metal with a rust inhibiting etch-primer. Is this true? Can I avoid this? What do any of you recommend after a chemical strip? I still plan on doing a bit of body work... Do I prime first? As you can see I have plenty of hours ahead of me. I just do not want to add any hours that can be avoided... Any suggestions?
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Old 02-14-2008, 11:00 PM
backdate backdate is offline
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Buy a powerful dehumidifier and take your time, I've seen plenty of restoration companies working on bare metal shells, this wouldn't be possible if you only had 5 minutes, leaving it a few days would be running a risk in my opinion but taking the moisture out of the air wil definately help matters.
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911S Impact bumper backdate project.
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  #3  
Old 03-04-2008, 04:39 AM
Christopher Toy Christopher Toy is offline
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Join Date: Jul 2007
Location: Laguna Beach, California
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Whatever chemical you plan to use, make sure it's not water solulable. You can't keep the liquid chemical out of body joints. Once it's in a joint, you can't fully clean it out either. It will continue to act, nothing you can do about it.
Why not media blast, soda blast, abrasives that won't go after metal, only paint, dirt grease etc? Whatever gets stuck in a joint will be harmless into the future.
You will get surface rust on raw metal over a short period of time unless you are working in the desert in the summer. It will be surface rust and easily sanded off just prior to priming. If still concerned, do the chemical conversion bit at the last minute but, you don't want even that liquid in any body joints.
If it's not a hot dry day, get a space heater, get the heat in the room up to raise the condensation temp. If humidity won't condense on the bare metal, it can't rust. I don't believe it's a problem unless you are working in a low temp and high humidity area.
Ever breath on a mirror when it's cold? Fog.
When it's hot? Nothing.
Have fun with that project.
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