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Join Date: Feb 2006
Location: Victoria BC
Posts: 363
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Rust Spot Removal Question
Below is a picture of a spot that the undercoating was scraped off. The car developed some surface rust and I have done a bit of work to remove it. I used some liquid rust remover and have sanded and scraped too. I looks far better now but any further improvements are going pretty slow. When i sand there is almost no noticeable rust coming off at this point. However, I suspect that there is still rust there on the blackish spots you can see in the pic. Should I keep scraping and sanding before I repaint and re-undercoat this spot or am I good now?
Thanks. 
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Tim 1972 911e |
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05-19-2006, 07:53 AM
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I would rather be driving
Join Date: Apr 2000
Location: Austin, TX
Posts: 9,108
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Looks pretty clean. Treat with a etch primer (wash or paint) and then top coat. Follow with some more undercoating (Wurth SKS is a good match) and you are done.
Good job preserving another early car. btw, the black deposits are likely a result of your "liquid rust remover." I suspect it was phosphoric acid based and those are phosphat residues.
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Jamie - I can explain it to you. But I can not understand it for you. 71 911T SWT - Sun and Fun Mobile 72 911T project car. "Minne" - A tangy version of tangerine #projectminne classicautowerks.com - EFI conversion parts and suspension setups. IG Classicautowerks |
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05-19-2006, 08:33 AM
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Thanks. The liquid rust remover is phosphoric acid and sodium nitrate. I am going to get a needle or something small into one of those deposits and see if any rusty looking residue comes out but given sanding is coming clean I am hopeful its good to go.
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Tim 1972 911e |
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05-19-2006, 09:20 AM
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Slumlord
Join Date: May 2001
Location: Canada
Posts: 4,983
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POR-15 metal prep then POR paint on top will do it.
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84 Cab - sold! 89 Cab - not quite done 90C4 - winter beater |
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05-19-2006, 09:38 AM
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POR-15 is a product used to encapsulate rust. I may recommend that product. www.por15.com
In my opinion, you could pre-treat and apply and be done with it, no picking with needles. Why not fill the hole while you are doing it, too? Maybe some 2 part epoxy or jb weld putty? Doug
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1971 RSR - interpretation |
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05-19-2006, 09:38 AM
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The hole is for a little rubber plug. There are a few of these on the bottom of the car. not sure what they are for but I planned on putting the plug back in once its painted and then undercoat the plug and treated spot. The other rubber plugs appear to have undercoat on them so thats why undercoat after the plug is in rather than before.
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Tim 1972 911e |
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05-19-2006, 10:11 AM
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3 restos WIP = psycho
Join Date: Feb 2005
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Since you already did the phosphoirce acid etch, I'd just paint it over with POR-15 and call it good.
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- 1965 911 - 1969 911S - 1980 911SC Targa - 1979 930 |
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05-19-2006, 10:27 AM
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Thanks everyone.
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Tim 1972 911e |
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05-19-2006, 11:31 AM
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