new repair rust protection

Hi guys,

I just pounded out a reverse ding in my hood, due to me leaving a wratchet under the hood and then shutting it...:stupid: Anyway I sanded it down, and then took a little propane torch to it and banged it out as good as I could get, which seems about 90% better. But now I have some exposed metal, do you guys have any suggestions how to protecht it? And I also banged out some dents in my rear bumper...