THANK YOU for all the replies about my car, and the rust, that I wish to hide.

I was disappointed as I thought that someone might give me some idea on how I could hide the rust using a less expensive technique. I DO understand that cutting the rust off, putting on new metal and repainting is quite a job and the body shops must get paid for all of this work and cannot guarantee it.

Because I did not receive any suggestions on how to hide the rust - would anyone like to give their opinions on "temporarily hiding the rust" in a cheaper way, with no guarantees... what do you think of fibreglass kits?
Thanks! :confused:

There is really not a solution designed to "temporarily hide" rust.

The best thing you can do that does not include expensive "repair" of the areas is grind it out and dab paint onto any bare metal that's left showing.

I'm curious: why do you want to "temporarily hide" the rust?

If you want a quick (and REALLY only temporary) fix, try this:

Sand the rust down with some rough grinding paper. Apply some sort of rust inhibitor on the remaining rust (I know I used some in the past for my 25+ years old washing machine, but I cannot remember it's name) and allow it to dry (if it has to). Take some sort of filling kit, and apply it to the area you need to cover the protected rusty area. Allow it to dry. Take some fine sand paper and sand the kit down until your satisfied with how flat it is. Apply the color to it and let it dry. Buff the area with wax after you're done.

This can be done in a very short time and can be done poorly if you really only need to TEMPORARLY hide the rust, and if the rust is not that bad that it ruined all the metal.

If it's that bad, you can try to duct tape it, apply filler kit, sand it down to make it flat, and apply color over it. But it's really quite a ghetto solution.