Hey uncle Scotty, what do you think about Rubberized undercoating, like the Bosny Rubberized Undercoat spray can? Planning to do that on our old 97 Corona. Just watched your video about things for the rust, but how about the ones that are on cans?
Thanks!
Nope. I stand by my results above.
Thanks sir and uncle Scott!
Common Rust-Oleum "Rust Reformer" is a thin, flat black spray paint that does a decent job of stopping rust.
Those thick "rubberized" coatings often bubble and crack. End up holding more moisture.
Thank you! Appreciate it
Here's a photo of my own truck frame, which had rubberized undercoating when I bought it. See how it's trapping dirt and moisture, causing it to rust more than if it were clean, dry metal?
Yikes!
Was it coated by the factory when it was made?
It was coated when new. This is the state of it with around 35,000 mi.
Don't do it, South Mail Auto Repair has a video showing how that stuff traps moisture against the metal and causes rusting. What you want is undercoating that is oil based such as Rust Check, Krown, and Fluid Film. I use Rust Check myself.
Typo, it was supposed to say South Main Auto Repair.
Thanks! Will try those out instead
If your vehicle is brand new or used but has no rust, you might try to find a soft rubberized undercoating or a garage that sprays hot roofing tar for undercoating. DO THIS ONLY ONCE. Just to get a thick coat on everything. Then every year after the first year, spray underneath with a thin oil. You can probably get a gallon of WD-40 cheap enough and put it in a pesticide sprayer. Hit everything underneath, right out to the bottom of the body panels and make sure you get areas known for rusting badly on your particular vehicle. DO NOT spray the brakes, drivetrain (Except the axles and driveshaft) or exhaust. The WD-40 will soften the tar undercoating and it’ll soak in some, reconditioning it. You might even get creative and throw a bottle of AT-205 Reseal or ZMAX in the sprayer.
you first
I did
The problem with tar undercoating is it dries out. Keep it sprayed with oil.
so you spray your vehicle every year?
With oil
Very interesting. Thanks!
Since I saw this thread come back up, I’ll also add that I really only spray certain areas with oil. Once or twice a year, I’ll spray dry looking areas of the rubberized undercoating with oil. Areas that are chipped, I spray with paint. Best would be rust neutralizer, then paint, then more rubberized undercoating and some claim 3M rubberized undercoating is the softest, meaning it’s probably the most crack resistant and won’t open up as often and let moisture in behind the rest of it.
Honestly, I don’t even get all the rust off, when I see some. I clean the area quick and coat it with something. And keeping up with it seems to be the biggest thing. If I just let it go for years, I’d probably have problems by now, 14 years later. I also wash the undercarriage throughout winter. I also wash with a garden house, up behind the fenders, particularly where dirt, salt, etc. would sit, up on top inside the wheel wells. And I made sure I thoroughly undercoated that area completely, when the truck was new and made sure no rust started popping through. So far it’s rust free!
I’m now even thinking of trying tire shine or something similar on the existing rubberized undercoating to prevent cracking.
Also, when I say wd40, I mean silicone wd40 or similar.