Rust Encapsulator Black Qt.
Product Review (submitted on June 13, 2013):
Product is very easy to apply, goes on smooth and from my experience does a good job against rust. I went over a trailer frame with a needle gun rather than sand blast and put a coat of rust encapsolator on it. Looks good and has not shown a reaccurance of rust now for two years. Trailer is not subject to winter road conditions with salt either so I don't know how it would be for that. Probably as recommended, one should top coat it with a good paint. I am currently doing another trailer frame and even though a bit expensive, I think it is worth it.