I found a few rust spots in the floor of my Jetta and want to get it patched up pronto. I'll treat the rust that's there with POR-15, but I'm wondering about VW's choice of undercoatings. I can see a few spots where the rubberized stuff is a bit bubbled and brown, where there is obviously rust underneath. I plan to wire-brush the coating off and treat what I can, and re-coat it.

I have heard NOT to use spray/brush-on bed liner products line Rhino Liner or Herculiner as undercoating, but I also know a fellow who used it during a restoration and swears by it. I'd like to use it on my rocker panels as well (after cleaning them up as best I can, of course). The factory stuff is bubbling it spots there as well.

Any thoughts? Thanks folks!

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1992 300D 2.5T
1980 Euro 300D (sadly, sold)
1998 Jetta TDI, 132K "Rudy"
1974 Triumph TR6
1999 Saab 9-5 wagon (wife's)

Oh, and yes, I have read the Herculiner/Hootus thread at http://www.explorerforum.com/forums/showthread.php?t=18595&page=1&pp=20&highlight=herculiner

__________________
1992 300D 2.5T
1980 Euro 300D (sadly, sold)
1998 Jetta TDI, 132K "Rudy"
1974 Triumph TR6
1999 Saab 9-5 wagon (wife's)