Do you put just apply it over the paint on the outside?  Or do you have to
sand and clean out the seam, or even worse, get in from the inside?

Thanks

>From: River Clan <ri@RIVERCLAN.ORG>
>Reply-To: River Clan <ri@RIVERCLAN.ORG>
>To: vanagon@GERRY.VANAGON.COM
>Subject: Re: left lower seem rust!
>Date: Fri, 3 Mar 2006 01:09:17 -0800
>
>I have had really good luck with 3M's grey sealer.... so far....
>
>Is that what you had fail?
>
>
>
>
>On Mar 2, 2006, at 9:45 PM, John Reddick wrote:
>
>>The seams don't rust until the seam sealer cracks.  No cracks, no
>>rust.
>>  If you see a crack in the seams fill it with something, I don't
>>care if it
>>is toilet paper.  A crack starts what is called an "oxygen
>>concentration
>>cell" type of corrosion.  A difference of O2 concentration causes a
>>bigger
>>voltage difference than most other types of corrosion.  That is why
>>bridges/pilings show lots of corrosion at the waterline, and little
>>above or
>>below the waterline. I have never seen a Vanagon with rust at a non
>>cracked
>>seam.  Just the opposite, I have an 86 Syncro that lived its entire
>>life in
>>CA.  The whole thing is beautiful.  Except for 1 12 inch section of
>>seam,
>>which is beginning to rust.  At the cracked seam.
>>     Now the question, what do you replace the factory seam sealer
>>with?  1
>>part polyurethane?  Catalyzed seam sealer?  I used very expensive
>>catalyzed
>>seam-sealer on a repaint of a van and it cracked in 9 months.
>>Anybody got a
>>good answer to that?  The sealer I used was 30 bucks a tube,
>>wholesale, body
>>shop stuff.  It wasn't flexible enough.
>>