I got i good size rust hole right behind my passengerside rear tire. I know the solution to this would be to cut it out, weld new metal in, bondo and paint. I actually did a pretty nice job on the threshold of my door. But the hole is kinda in a wierd spot and looks very hard to get some good beads in there. Anyone know of some good alternatives. Maybe a foam or a jelly or something? just somethin that i can fill this hole with so i can slap some bondo on to keep this from spreading

 

 

you can't really keep rust from spreading once it has started.