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vwwestyman
Samba Member
Joined: April 24, 2004
Posts: 5688
Location: Manhattan, Kansas, USA
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 Posted: Wed Mar 04, 2015 9:21 am Post subject: Quick rust stopping/slowing |
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I've got some rust on the panels over the transmission/under the gas tank.
I was thinking of hitting it with a wire wheel, spraying it down with phosphoric acid, letting that dry (or do you rinse it after the rust turns black?), and hitting it with some rustoleum for now. Maybe one day I'll do a more proper restoration of the bus, but for the moment I'd simply like to just stop the rust from progressing.
Or I could hose it down with bar oil or something like that. Again, I'm not going for pretty in this unseen area, just stopping the crusty rust from progressing.
Thoughts?
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President, Wild Westerner Club
1978 Champagne Edition Westy, repowered to '97 Jetta TDI
1973 Wild Westerner
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PITApan
Samba Member
Joined: November 09, 2014
Posts: 1058
Location: Northern Colorado
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| Posted: Wed Mar 04, 2015 9:36 am Post subject: Re: Quick rust stopping/slowing |
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| vwwestyman wrote: |
I've got some rust on the panels over the transmission/under the gas tank.
I was thinking of hitting it with a wire wheel, spraying it down with phosphoric acid, letting that dry (or do you rinse it after the rust turns black?), and hitting it with some rustoleum for now. Maybe one day I'll do a more proper restoration of the bus, but for the moment I'd simply like to just stop the rust from progressing.
Or I could hose it down with bar oil or something like that. Again, I'm not going for pretty in this unseen area, just stopping the crusty rust from progressing.
Thoughts? |
The phosphoric acid treatment will convert thin rust to iron phosphate. Wire wheel off the chunks. Yes, rinse well. The phosphate offers no protection. But it's chemically bonded to the steel and it's porous. so oil or paint penetrates and sticks like crazy. This is what "black phosphated" fasteners are about. oiled iron phosphate.
I would use both your strategies. After the phosphate is rinsed and dried, hit it with a good primer, several coats, then the paint. Let that cure a week or better (if it's warm) then go with the cosmoline.
Waxoil either commercial or home made, CRC SP-400, LPS3 or one of their other waxy film products, etc. There are many brands. I have a gallon of LPS 3 and it's excellent. Brush on with a chip brush or spray with an undercoating gun.. Skip the bar and chain oil. |
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Tcash
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Joined: July 20, 2011
Posts: 12844
Location: San Jose, California, USA
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Thrasher22
Samba Member
Joined: October 05, 2010
Posts: 858
Location: Calgary, Canada
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| Posted: Wed Mar 04, 2015 1:27 pm Post subject: |
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You've got the right idea! Remove as much of the rust as you can so the acid will penetrate further down.
Since that's a small area, make sure to use a proper air filter and safety goggles, phosphoric acid is nasty stuff with lots of fumes.
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jtauxe 
Samba Member
Joined: September 30, 2004
Posts: 5780
Location: Los Alamos, New Mexico
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| Posted: Wed Mar 04, 2015 1:33 pm Post subject: Re: Quick rust stopping/slowing |
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| PITApan wrote: |
The phosphoric acid treatment will convert thin rust to iron phosphate. Wire wheel off the chunks. Yes, rinse well. The phosphate offers no protection. But it's chemically bonded to the steel and it's porous. so oil or paint penetrates and sticks like crazy. This is what "black phosphated" fasteners are about. oiled iron phosphate.
I would use both your strategies. After the phosphate is rinsed and dried, hit it with a good primer, several coats, then the paint. Let that cure a week or better (if it's warm) then go with the cosmoline.
Waxoil either commercial or home made, CRC SP-400, LPS3 or one of their other waxy film products, etc. There are many brands. I have a gallon of LPS 3 and it's excellent. Brush on with a chip brush or spray with an undercoating gun.. Skip the bar and chain oil. |
x2 This is the method I learned while at sea, where rust is a constant maintenance issue. It's also where I learned to love LPS-3. That stuff is great!
That will at least stop the rust from advancing until you can work on a more permanent solution.
_________________
John
"Travelling in a fried-out Kombi, on a hippie trail, head full of zombie..." - Colin Hay and Ron Strykert
http://vw.tauxe.net
1969 Transporter, 1971 Westfalia, 1976, 1977, 1976, 1977, 1971, 1973, 1977 Westfalias,
1979 Champagne Sunroof, 1974 Westfalia Automatic, 1979 Transporter, 1972 Sportsmobile, 1973 Transporter Wild Westerner, 1974 Westfalia parts bus, 1975 Mexican single cab *FOR SALE*, 1978 Irish 4-door double cab RHD
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