Closed cell expanding foam, For all those nooks and cranys that collect road grime Options

[tbox56]

I have been working on a little bit of rustoration on my 72 subie conversion, and found a couple of areas that have some of the dreaded 'rust bunnies'. One of these is just behind the doors, just on the inside of the vent tube, and the other is by the taillights on toward the outside of the car. after looking at and repairing these areas, i think that the best way to protect them is to keep all of the road grime and moisture out. My thought was to take some 2 part expanding closed cell foam and fill these spots. I found three products on 3M's website that look like they would work. Does anyone have any experience with these products? Foams and NVH

Thanks in advance
Thomas

[Bartlett 914]

This thread makes me think or Firestone radial tires. These steel belted tires went bad in a bad way. The steel would rust inside the rubber and the tires would come apart later. The problem was that they used a slurry like material on the steel belt just before placing it in the mold. The container was open to the air and absorbed moisture. This caused the belt corrosion. Since some of our cars had a problem more than others, I cannot help but wonder if a similar condition happened here. Maybe the foam got contaminated. It also could have happened to cars that were made on more humid days.

I would leave the stuff out just the same.