POR needs to be painted for those areas that get exposed to light - UV
breaks down the polymere's - and it becomes useless.

Even better than the underbody though, would be to paint the interior of all
the panels in POR, particularily the interior seams.

If you POR the exterior, remember that you have to sand the exterior after
the POR, in order to get a pretty surface.

This could cause tiny pores or exposed areas - so a second coat may be
required.

To do this right - it is a huge job, and I know as I have done it! (the
exterior).

Although you didn't ask me, I think the greatest bang for the buck is to do
the underside, and the interior of the panels. The finish does not need to
be perfect there, and you could really slather the stuff on.

Oh, I also did the sliding door track - that gets rusty real quick.

Best of luck - it's a worthwhile project on the areas I recommended, the
other areas may not be worthwhile.

Marshall Ruskin
84 Westy

> I really want to be able to drive my van year round, but I
> want to protect it as best I can from rust. So I was thinking
> about doing the entire underbody (a la http://www.bulley-
> hewlett.com/VWindex/)and maybe the first 12" (up to the
> indentation in POR-15. But I don’t think you can use POR-15
> over paint… has anyone done this?
>
> Thanks,
> Chris
>

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