That’s been my experience too—those thick rubber sprays can actually backfire if you miss a spot. Ever tried using something like Fluid Film or a lanolin spray? I’ve heard those lighter oil-based coatings don’t trap moisture as badly. Wonder if that’d help with the salt and hail combo...
I’ve tried Fluid Film on my truck’s undercarriage, and honestly, it’s a mixed bag. It does seem to keep the rust at bay better than the thick rubber stuff, but you’ve got to reapply every year or two or it just wears off. I get why people like it, but I’m still not convinced it’s enough for places where salt and hail are both a problem. The lanolin sprays are similar—less mess, but I’m not sure they hold up to a real winter. Maybe if you’re religious about reapplying... but that’s a chore in itself.
I’m still not convinced it’s enough for places where salt and hail are both a problem.
I get what you’re saying, but honestly, I’d take Fluid Film over the thick rubberized stuff any day. That rubber coating just cracks after a couple winters, then you’re stuck scraping it off. Yeah, Fluid Film needs redoing, but at least you can see what’s going on underneath. Ever tried just washing the undercarriage more often instead? I know it’s a pain, but sometimes that does more than any spray. Curious if anyone’s actually had rust issues with Fluid Film in heavy salt zones...
I’ve wondered about Fluid Film in salty areas too. My neighbor swears by it, but he’s also the type who power washes his truck every week, even in the dead of winter. I’m not that dedicated, honestly. I tried the rubberized stuff once and it looked good for a year, then started peeling off in big chunks. Total mess to deal with.
With Fluid Film, I like that you can see if rust is starting, but I do worry about how often you have to reapply—especially if you’re driving on salted roads all season. Does it just wash off after a few storms? I’ve heard mixed things. Anyone ever try combining regular undercarriage washes with a lighter spray-on coating? Or is that just overkill?
I’m in a spot where we get both hail and salt, so I’m always second-guessing what’s actually worth the effort. The last thing I want is to spend all that time and money and still end up with rusted-out rocker panels...
I hear you on the rubberized stuff—mine looked great until one winter, then it just started flaking off everywhere. Total pain to clean up. Fluid Film’s nice because you can spot trouble early, but yeah, it doesn’t last forever, especially with all the salt and slush. I’ve found that a quick rinse every couple weeks helps, but I’m not out there with a pressure washer in January either. Tried a lighter spray-on coating once after washing, but honestly, it felt like more work than payoff. Still ended up touching up spots by spring. It’s tough to win against rust when you’ve got both hail and salt in the mix...