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ospho
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ABinNC
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Joined: July 28, 2004
Posts: 42
Location: North Carolina USA
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PostPosted: Wed Feb 01, 2023 4:57 pm    Post subject: ospho Reply with quote

I have a question about ospho, I used it on a fender and it left dark spots on the metal where it converted the rust, the question is do I need to dig out all of the dark spots or can I prime over it
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esde
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Joined: October 20, 2007
Posts: 5927
Location: central rust belt
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PostPosted: Wed Feb 01, 2023 5:07 pm    Post subject: Re: ospho Reply with quote

The black is iron phosphate (neutralized rust)
you can prime right over it.
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beetlenut
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Joined: May 27, 2009
Posts: 2980
Location: RI
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PostPosted: Wed Feb 01, 2023 6:30 pm    Post subject: Re: ospho Reply with quote

ABinNC wrote:
I have a question about ospho, I used it on a fender and it left dark spots on the metal where it converted the rust, the question is do I need to dig out all of the dark spots or can I prime over it


It's atomic primer. Prime right over it.
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scrapyards are for quitters
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Wetstuff wrote:
... I spend more time shaking it than directing it?! I get a pretty decent blast for 8sec. then have to shake it again.
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My 74 Super rebuild thread: http://www.thesamba.com/vw/forum/viewtopic.php?p=6507104#6507104
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Nacho_74
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Joined: March 22, 2018
Posts: 53
Location: Norwalk,California
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PostPosted: Thu Feb 02, 2023 7:53 am    Post subject: Re: ospho Reply with quote

OSPHO The only stuff I use other than elbow grease...
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