Well Eastwood of course says their Rust Encapsulator is it.

http://www.eastwoodco.com/jump.jsp?itemID=852&itemType=CATEGORY&path=1%2C3%2C688%2C821&KickerID=412&KICKER

The link is to a supposedly independent comparison test.

I use quite a bit of the Eastwood stuff.  I've never tried POR-15 because of
the additional prep work and lack of UV resistance.

Larry A.

On Mon, Jun 30, 2008 at 5:32 AM, Frank Condelli <RAlanen@aol.com> wrote:

> In a message dated 29/06/2008 10:01:15 A.M. Central Standard Time,
> LISTSERV@GERRY.VANAGON.COM writes:
>
> Troops:  If I decide to jump in with both feet and do some  serious
> rust removal on my two Vanagons, is there a better product  for
> treating the existing rust on the Vanagons than POR-15?  My  own
> personal experience with the product has been mixed for sure.   I
> thought it would be the be all end all for redoing the rusty roof  on
> our Chrysler Minivan, but after stripping the rood paint down to  bare
> metal, sanding, painting the POR clear stuff on, scuffing that,  and
> then painting the POR top coat over it,  all was well the  first
> year.  By the time we junked out the car due to body damage, the  POR
> was crumbling and flaking off at an alarming rate.  I used the  Marine
> clean as directed, the metal prep as directed, and still  this
> failure.  that's not going to happen with the Vanagons, so I'd  like
> to hear of better products you've used that have withstood the  test
> of time and salty winters.  I realize prep is key here, but the  best
> prep can be ruined by inferior product.  Inquiring minds wanna  know
>
>
>
>
>
>
> Well.......I  have been using POR-15 for over 20 years and have experienced
> the problems  your having BUT they were all related to improper preparation
> and
>  application.  Most all POR-15 projects I have done have stood the  test of
> time and I do not think there is a better product.  The success  of a
> POR-15
> project is in the preparation and application.  NUFF SAID  !
>
> Cheers,
>
> Frank  Condelli
> Almonte, Ontario, Canada
> '87 Westy & Lionel Trains (_Collection for sale_
> (http://members.aol.com/Fkc43/trainsal.htm) )
> _Frank Condelli &  Associates_ (http://members.aol.com/Fkc43/busindex.html
> )
> - Vanagon/Vanagon Westfalia Service in the Ottawa Valley
> _Vanagon Stainless Steel Exhaust  Systems_
> (http://members.aol.com/Fkc43/exhaust.htm)
> _BusFusion_ (http://members.aol.com/BusFusion/bfhome.htm)  a VW Camper
> camping event, Almonte, ON, June 12 ~ 15,  2008
>