Mustang convertible leak?
That sucks, sounds like whoever fixed it did not do a very good job. Take it to a body shop and have it put on the frame, check and see if it's bent, It does not take much to bend the convertibles as the don't have as much metal in them. Mine was rear ended after leaving a stop sign, both cars, I turned right after the light and the guy that got me got my left side rear bumper. When I got out and look I though it had just scratched the bumper cover and piss me off. Got it home and the impact had dimpeled the rear quarter panel over the rear wheel.