Herb:

I first used POR-15 on my kid's Chevy Cavalier, a rust magnet, and it worked fine (although it cannot prevent rust occurring on the other side of a painted body panel). I've also used it on old Raleigh bikes, likewise prone to rust, and they are still spotless under their new paint.

The only problem I've had is that the stuff is moisture-cured. So if you get ANY moisture in the can, the next time you open it you've got a hardened block of catalyzed paint at $20 a pop. Most people buy small quantities at a time, or divide up a larger quantity into glass jars with secure screw tops. Remember too that it is UV sensitive: it has to be topcoated if any sunlight will hit the painted spot.

Anyway, I am definitely going to do this on my three 940s as well as the 740. $1500 worth of rusted fuel sending units does not appeal to me.
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See the 700/900 FAQ under 'Select Link' button on the top right.