Joe,
I used Black POR15 on mine and it still looks great 18 months later.  I wire
brushed it, sanded it and prepped it with POR Metal Prep before I applied
the POR15.  I did both sides so as an added bonus it was a reasonably clean
surface to lean against when I replace my heater control valve.

Andrew

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
Joe Federici
Sent: Thursday, November 08, 2007 11:34 AM
To: vanagon@GERRY.VANAGON.COM
Subject: question about painting the spare tire tray

I want to paint the underside the spare tire tray black. Mostly for
cosmetic reasons and I'm wondering between just using something like
por 15 and semi glass black or  undercoating with a spray on brand.
My fear is the undercoating is a real PITA to take off at a later
date. The por isn't so bad as it can be painted over if need be at a
later date. My van at least seems to have some undercoating on it but
not so much on the underside of the tray, the part you see when
looking at the van.

So what have others done and found worked best.

Joe F