has anyone used things like this, or had any experience with them. The car i just bought has a few rust pockets, around 10, most of them are pretty small but there are a few ones that leak into the car and id like to plug them up without having to cut it all out and weld in a new peice. So how does this primer work? and how effective is it?

 

I haven't had too much rust inhibiting success with those "turn rust into primer" products. In all seriousness, the green bondo with pieces of fiber in it, I think it's called bondo glass or some such, works beautifully. Just sand out as much rust as possible, and the fiber bondo somehow bonds better than regular bondo to bare metal. It's made for boats so it's waterproof. One of my little fixes that I did about 1.5 years ago is still rust free.

 

If you're trying to treat rust, clean it up with a dremel, and then wipe/soak it with a product called "Ospho". It comes in a gallon jug. It turns rust (Iron Oxide) into something like Iron Sulphide, which is non-reactive. Then go to town with whatever bondo/primer products that you favor.

 

Just Ospho it wait for 24 hrs, go back over it with soapy water and a scotch brite, and rinse. Dry it out with compressed air, or wait for the rapture while it air drys. Put either magnum steel in the car or use the fiberglass and body filler mix someone mentioned earlier. Smaller spots i'd go with the magnum shit. Just sand that down and primer it before condensation get on it. Definately don't Ospho and let sit. You paint over/after the Ospho within 48 hrs, but ideally before condensation gets on it. I.E. don't let the car sit in the elements over night.

 

I used the spray stuff, which works decently with a little surface rust..but I had to grind down the big scary rust to almost bare metal before it would work

 

all right, thanks for the responses guys, i know it wouldnt be super expensive to have a body shop do it, but im hella poor, and am not a large fan of welding myself.