Forget spraying rubber, it just falls off THIS is rustproofing, baby! (see attachment) I am one of those unfortunates with only one car so it gets driven on roads absolutely white with salt. There were salt _crystals_ on the bottom so I said ef this! I need to rustproof! I remembered how clean oily parts of the engine looked so I got an idea.... 7 tubes of chassis grease smeared all over the bottom. I pumped that stuff into every crevasse, every hole, the outisde and inside of every piece of equiptment down there with the exception of the exhaust, driveshaft and transmission. Total cost = $18. Total time= 2 nights. This was MESSY. OMG, you should see what my "work clothes" look like. I'm gonna need to soak them in fast orange for a week! This bad girl will never ever rust again! CrazyPete in the house!