Ford F150 - spray rust preventer

When I got my door repaired after someone backed into it the guy who owns a local body shop here said that the doors really have a problem at the lower part where the skin folds over the door panel. He showed me what he uses to prevent it and it was a spray type substance that comes out like WD40 but not as runny, then it dries into a waxy substance. It literally feels like candle wax. Anyways this is supposed to keep rust from forming by keeping water out of little grooves. I will try to find out what it is called and get back.

Sounds just like AMSOIL's HD Metal Protector.

Dries to a wax like lube.

I bet it's a similar product.

Personally, I'd POR-15 it. Something I've been meaning to do to mine for a while now.

Will POR-15 stop existing rust?

Yes POR-15 stop rust formation where you use it, but it does not eliminate it. Youll need a rust convertor or sand it then seal it for that.

rust converter?

A rust convertor kills the rust itself so it can't spread anymore. It actually neutralizes the rust and then it turns it black and seals the original metal. I used a product by Jasco but you can go to interstateproducts.com and they have info on it too.

the bottom of my doors on my 99 are starting rust pretty good so im' looking for a simple solution here. thanks