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Please, lets call it a metal patch, not a tin can patch.
I used the stuff below but it did not say Locktite and whoever makes it bought the license to use the Locktite name.
Some boat builders are touting that its water proof. I use it on many outdoor projects, example, as a sealant on water barrel faucets. But like I said, the inside red paint flaked off the stuff.
If you go with a metal patch, weld or screw on, use fiberglass outside and inside as a minimum. If I were to do it again I would use POR 15 epoxy putty The one pound pack would have been enough. Apply when warm--see the floor patch link by Swedish Baklava.
Undercoating removal, I got medieval on it and used sharp but cheep wood chisels and a rotary wire brush then cleaned off the film with solvent.
The mud flap is indeed screwed onto the car with easy access screws. The attachment will be well hidden by road crud.
Add edit: In the 244, maybe the same as the 245, the rust out was where three pieces of body joined and was sealed with a white bondo like material. This bondo joining could not have been of any structural importance therefore I believe any water proof patch would work and not diminish the integrity.
Tom
re: 87 245 auto - welding rusty floor spots
http://www.homedepot.com/buy/loctite-pl-premium-10-fl-oz-polyurethane-construction-adhesive-1390595.html#.URl9PfJhjO8
http://www.por15.com/EPOXY-PUTTY/productinfo/PU/
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