I have a slight bit of rust on my 04 GX, nothing major, but would get worse if not treated as is with all of these vehicles. Wondering if I should go down the route of sanding it all down and using Por-15? Or, will a yearly application of Fluid Film do the job just fine? I don't mind what's on it now, I just don't want it to get worse. Anyone had experience with Fluid Film/Krown/Rust Check?