I feel the same now. After rustproofing our two previous cars their entire life I found they ultimately rusted out like anything else plus the mess is annoying. We opted to rubber spray the bottom and get the electronic unit not because I think it works, more because the warranty covers rust. We now just wash our cars much more frequently. Guess we'll see in 10 yrs.ive always been suspicous of whether or not "rust proofing" really prevented the formation of rust
We used to have the oil spray done and found that panels would rust in the usual spots due to sound deadening materials. The constant fluctuations in temperature caused the layer between the steel panels to get wet and rust inside out. I like the rubber products but you shouldn't add oil to it since it will ruin the rubber, or at least from what I can see. One thing I found is the car that was garaged in the winter rusted the worst. I would suggest not parking indoors in the winter to avoid the fluctuations in temperature. My opinion though based on my personal experience, take it with a grain of salt.It only keeps the bottom of the car from rusting. It does absolutely nothing for any of the body panels. That said, it can keep your frame and control arms and such from rusting out. Or at least prolong their lifespan.