Rust be gone

[Bad bug]

Originally Posted by rustbucket

POR-15 is not necessarily the best option. It really depends on where the rust is. If it is under the exterior paint, do not use POR-15 or anything else like it. The only cure for surface rust under the paint is a quality primer. The rust needs to be removed, either mechanically or chemically, and then sprayed. If it is the pans, look at the POR alternatives. Eastwood sells a good one, and there are several more. I've used POR in the past and had mixed results. It is very prep intensive whereas others are not.

The rust is on the quarter panel. I used osphor to remove it. Has anyone used osphor before.

[rustbucket]

I've never heard of it. I tend to shy away from chemical means. Too many factors involved to get a good result.

If it's the quarter panel, do some serious looking to make sure it is not rusting through the panel. If that is the case, then no measure short of replacing the panel will do. While replacing the panel, spray the inside of the body with an aircraft wax (Eastwood) or some type of undercoating. And be sure to get as much of the insulating foam out. That is the cause of the problem usually.

DO NOT use POR-15 or any other similar product on the outside of the car. There are numerous reasons, but the best is that it is a royal pain to sand it smooth. Almost impossible once it has dried.