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Killing rust

Hummm. Most of the rust is being cut out at least an inch from major rust and newer metal welded back in. This time I am not over lapping, but edge to edge sheetmetal welding.
But, under neath the lip of the rain tray has a bit of surface rust where the paint is stripping away. As Ren & Stimpy used to say "Ack Barf"
What happens to the acid when applied to a light surface rust? Does it need to be cleaned off? I could buy that stuff locally.


>-----Original Message-----
>From: Sandor [mailto:sandor@vwot.org]
>Sent: Monday, March 13, 2006 03:46 PM
>To: julie@menloparkrandd.com
>Cc: 'Bob', scirocco-l@scirocco.org
>Subject: Re: Killing rust
>
>> Holy cow. Phosphoric acid as a component? Can we say dangerous?
>> AND $100 per case, 4 gals per case. Good find though!
>The metal ready stuff in the POR 15 system is in fact Phosphoric
>acid...most decent body shops use Phosphoric on rusty metal after
>sandblasting (actually, most decent body shops cut out rusty metal
>alltogeather but...there are some that acid etch and then there are the
>majority that don't do either).
>IIRC the POR15 stuff is rather pricey...but I have had good luck with
>Sherwin-Williams Phosphoric Acid treatment in bulk.
>
>cheers
>sandor
>>
>> nal Message-----
>>>From: Bob [mailto:angus6@warpdriveonline.com]
>>>Sent: Monday, March 13, 2006 01:51 PM
>>>To: scirocco-l@scirocco.org
>>>Subject: Killing rust
>>>
>>>If you really want to kill it use Ospho end of story. Do a search and
>>> check
>>>it out. If you've ever spent any time working in a shipyard you'll know
>>>where I'm coming from.
>>>http://tinyurl.com/o774e
>>>
>>>
>>>
>>>_______________________________________________
>>>Scirocco-l mailing list
>>>Scirocco-l@scirocco.org
>>>http://neubayern.net/mailman/listinfo/scirocco-l
>>>
>>
>> _______________________________________________
>> Scirocco-l mailing list
>> Scirocco-l@scirocco.org
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>>
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