You get it on you( and you will ) be prepared to wear it off.I've used POR-15 and it is for exactly what it says it's for, painting over rust. It is even good for filling small pinholes. I wouldn't recommend it for an almost rust-free area like your floor pans, unless needed on the underside. It is extremely durable for rusty stuff, though, and it smells LOUD so use it in an open area with a fan and or a respirator and some safety glasses and gloves. Plan to get it on your clothes. It's like eating spaghetti with a solid white suit on. I spilled some on my garage floor a year and a half ago, it has been driven over daily and is absolutely un-phased. Don't get it on your skin!