Fixing rust on top of my wheels! How much do I sand?
 

I noticed just today that the upper portion of my driver side back wheel has got rust. I took a sand paper and started cleaning it hoping to remove the rust and apply primer-paint on it but as I started sanding it, it got worse - something started coming off! I am not sure if this was the metal or the paint so I sprayed it with some primer and applied some spray paint. I should have taken the picture before spraying it but I panicked!

I was checking online to see how to fix this Rust Stop Paint. It says I need to sand the rust off but when do I know how to stop sanding? When I kept sanding, I started seeing the inside (as if it was being eaten alive!) and am not sure if I just buy that product and apply it or I continue sanding. Any suggestions please?


http://img135.imageshack.us/img135/9...0709170505.jpg
https://img847.imageshack.us/img847/...0709170517.jpg
https://img814.imageshack.us/img814/...0709170535.jpg

Looks like that might be the clear coat coming off...

Hmm... you think so? I thought the metal was just falling down in pieces when I saw it. The more I was sanding it, the more it kept falling down so I stopped after a while thinking that I would destroy it completely. So do you advice me to take it out completely before applying the rust paint? Also, I saw something called Bondo putty. Do you have any suggestions related to these? Thank you.

That wont work on alloy wheels..if your wheel is crumbling that bad then I would suggest a new or used wheel replacement...

Oh no. My wheels are perfectly fine. It is the bender above the rear passenger wheel.