I wouldn't be concerned about the damage spreading in that short of a time...we're coming out of the Winter months anyway. If you're getting rid of it, I guess it wouldn't be a big deal to use spray paint, so long as the new owner knows it's not automotive paint.
Have you tried...
Hey everyone! First time poster here!
It seems like that rust is worse than it looks at first glance. Other than the chip on the top edge, there also appears to be bubbling on the upper left corner of the windshield (to the right in the picture). I would also be willing to bet that there was...