Rust-O-lium "Never Rust"

On a recent trip in the RV I noticed I had a leak in the front cap. Because of time constraints, as well as a "No fix RV's policy at the park" I decieded to wait until I got home to make a permant(?) repair, but it was bad enough that water was getting in when it rained. I went to a Lowes and purchased the Never Rust product, and within 30 minuets had applied it to all joints on the front cap. It stopped any water from entering and I have been thru several real down pours since. I eventually cleaned and cualked the area which apeared to be leaking.

My question is has anyone else used this product? If so was there any long term problems, i.e. Yellowing, pealing, etc? Your response would be appreciated!