POR 15 is great, and durable, but REALLY particular as to how it likes
to be applied. I really doubt anyone could get the underside of a van
clean enough to do a POR15 application... it really only works on bare
metal.

The POR 15 that I know and have used for years only works on rusted
metal-perfect for the underside of most VW buses.    Jeff
Jeff Stewart
fonman4277@earthlink.net
http://autos.groups.yahoo.com/group/vwcampersmidatlantic/