Are there any downsides to spraying high-temperature paint as a rust protectant for the underside of your car? - Quora
![I applied rubberized undercoating (Rustoleum reform & seal) to a portion of my car. I then read that it can make rust worse. The metal was dry and the humidity was 50%. I applied rubberized undercoating (Rustoleum reform & seal) to a portion of my car. I then read that it can make rust worse. The metal was dry and the humidity was 50%.](https://i.redd.it/this-is-rust-right-im-not-just-being-paranoid-do-i-just-v0-ymw9pkf8c2691.jpg?width=3024&format=pjpg&auto=webp&s=bf4a4e15cbf2c50b441b860b9765734bc2c8e607)
I applied rubberized undercoating (Rustoleum reform & seal) to a portion of my car. I then read that it can make rust worse. The metal was dry and the humidity was 50%.
![Amazon.com: Rust-Oleum 248656 Professional Grade Rubberized Undercoating Spray, 15 oz, Black : Automotive Amazon.com: Rust-Oleum 248656 Professional Grade Rubberized Undercoating Spray, 15 oz, Black : Automotive](https://images-na.ssl-images-amazon.com/images/I/71-3C2toJIL._AC_UL600_SR600,600_.jpg)
Amazon.com: Rust-Oleum 248656 Professional Grade Rubberized Undercoating Spray, 15 oz, Black : Automotive
![1 Year Results! Rust-Oleum Rubberized Undercoating VS Truck Bed Coating | Vehicle Frame | Rustoleum - YouTube 1 Year Results! Rust-Oleum Rubberized Undercoating VS Truck Bed Coating | Vehicle Frame | Rustoleum - YouTube](https://i.ytimg.com/vi/_taZm2IJHwg/mqdefault.jpg)