I just did a whole bunch off research on it and POR-15. I ended up going with the rust bullet due to the fact that it is uv stable and doesn't need a topcoat to keep thesun off it. I haven't done anything with it yet, but will post up once I do.
Where did you get it?
Pretty sure you have to order through their website, that what I did. I order the 6 pack of 4 ounce cans. Apparently once you open it you have to use it up, so I went with the smaller ones.