Mattb,
The rust is pinholed thru the metal. It will need surgery.
VP shows a couple of different patches, but I think this one has enough "meat" to cover the whole area:
http://212.247.61.152/US/main.aspx?page=article&artno=9025591
I'll have quite a bit extra, oh well.....
For the undercoating, my son (recent college grad, still looking for work) went out a couple of mornings last week and worked on it with a grinder/wire wheel. And it does work. And no, he did not volunteer!
But...… It creates such a huge mess! We park our daily drivers in there, as well as my 1966 Wildcat convertible (it's a 40X30 CMU shop). I have no problem with spraying kerosene, let it sit, spray more, and scraping. And it saves the errant wire bristle in the arm, or behind my mask (which still happens).
For the pinchwelds around the bottoms of the rockers and other really tight spot, I will still hit it with the wire wheel.
Now that summer in STL is in full swing, and it's 98 deg. out, work will be slowing. The cinderblock construction is like an oven. 98 deg. outside is 110 deg. in the garage by the time I get home from work. Early mornings on weekends is about the only time I'll be able to get out there!
Steve
Steve