Whereabouts in OP? I love OP man.. good place and good times.
BUT. The rusterminator my dad installs is only like 100$ or 200$ or some ****.. and there is a company guarantee. My dad told me that it needs to be installed in a very specific way or else it wont work.
My dad says there is some fine-print warranty info though. Supposedly these systems are supposed to prevent ROT and rust-THRU.. not necessarily surface rust.