Myths Debunked in The Toughest Undercoating Test! Winner may surprise you!

One of the toughest and most realistic tests of some of the most well known brands in car undercoating & rust protection, along with some lesser known names. We debunk some myths and crown a winner that may surprise you.
For a much deeper dive into rust proofing, here is a 2-part blog-

In this video, we test No-drip oil, Krown Rustproofing, Fluidfilm, Extreme guard, Oil Gard, Corrosion Free, Rust Check and Waxoyl. This set of tests is one of the most comprehensive that you'll find.
We fully considered real world vehicle issues when creating these tests and only chose products designed and sold for automotive use.

0:00 Intro and test parameters
1:12 Products & benefits
4:52 Test layouts and why
6:16 Creeping test
7:32 Hardcore testing begins
10:38 Driveway Drip test
12:04 Initial rusting results
14:42 Overall results discussion &
16:02 Important notes

#Undercoating
#Fluidfilm
#krown
#rust
#rustcheck
#Waxoyl
#oilspray
#rustedcars
#rustproof

Link to test data-

Additional blog posts covering more subjects:

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[maptap]

Great test. I would like to see a rematch with the following added to the Waxoyl "high performers" : Woolwax, CRC Marine Corrosion Inhibitor, LPS 3, PB Blaster Surface Shield (apparently very close to Fluid Film).

[jasons]

This is some really great quality content and one of the most comprehensive tests of its kind here on youtube. Thank you.

[JK-rvtp]

Great test! I've been using Corr Free and Fluid Film on my cars lately but will try the waxoyl this year. I stopped using Rust Check some time ago because low visc oil swells rubber and ruins door seals etc. I like the idea of a lighter oil for interior panels and the heavy stuff for the ext and have tried thinning Corr Free with varsol for interior panel spray to get it to atomize finer and drift around the panel interior more. I've found that the dust application toughens the coating and used to try to find a dusty road to drive on after treatment but now I just blow either limestone dust, or sometimes MDF sawdust, which is fine enough to go everywhere if you blow it under the car.

[james-sc]

I have been using Fluid Film for 15 years on my daily driver in PA. Zero rust anywhere on the truck. The product is not meant to be pressure sprayed, nor do they claim that. The great thing about wool wax/Fluid film is they are not permanent.

[mackendw]

I have an 03 land rover which had set for 7-8 years before I got it. In the Massachussets area. I bought it and took it to florida. cleaned the scale build up on the underbody and hit it with 4-5 cans of AmSoil HD Metal Protector. fast forward 3 years. No more rust. It halted the rust from doing any more damage. great product.

[herrmagoo]

Thank you for this informative video. If you plan to expand your testing even further, it would be interesting to include LPS 3 to see how it holds up to these conditions. Great job!

[gronva]

Great job! Really appreciate the work you put into this. Very curious to know how B'Laster Surface Shield would stack up. It is becoming more available in Canada.

[FrankBullitt]

Corrosion free is the best one that you can have a shop apply for you, but make sure its a good shop. I had a detailing / oil change / car wash place do it in Toronto (Sherway area) and the kid spent 2 hours painting my 4runner with it. I moved and took it to a speedy down in London and it was such a poor application I had to take it back. Used Oil gard once, by spring it looked like no oil had even been applied. Krown I think works best on a pre rusted car, it penetrates the rust and makes it fall off. After that I'd go corrosion free or the one that won this, but you'll have to do it yourself.

[danbaumann]

It'd be most interesting to see how old school lindseed oil and/or Penetrol stacks up against these specific rust inhibiting products.

[xsergy]

Great video, thanks bud. I was about to spray the old jug of Corrosion Free I have but seeing how it does makes me think it's not ideal. Rust Check is pretty readily available in my area though so I think i'll get that. Waxoyl doesn't come in sizes that work for me, plus the lack of creeping makes me question it for inside panels.

[jagersxford]

I use PB Blaster's, Surface Shield, I've been very impressed by it's longevity. Some people in my area have used NH black. I't as bad if not worse than Crown.

[haroldrodriguez]

great job testing. great video overall. Nice job!

[GTrainRx]

I like how you went all in on getting the 1970's vibe!

[thomasbartlett]

Happy Fathers Day from Northern Vermont. Been treating my cars for over 25 years using quality Bar & Chain oil heated with wax and grease on external areas and straight B&C oil or Transmission fluid for all enclosed areas . The thinner oils creep the best and work great within enclosed areas, while the B&C oil goes on high splash exposed areas. I never looked back... Thanks for all your work and posting this great video...Tom

[akdomun]

Krown has the best marketing department. They're literally everywhere in Southern Ontario, Canada, yet Fluid Film installers are so hard to find.

[ajm]

Test "Surface Shield" from Power Blaster. Sold at Home Depot. Has great reviews. Sticks very well.

[FeydHarkon]

Thank you for Sciencing this Mr. Sciencer

[tinker]

You should try Dominion Sure Seal, rustproofing, my understanding is that they make it for rustcheck and it is substantially cheaper if bought in larger quantities... The lighter viscosity makes it creep very well

[canctheayr]

Great vid. Covers a lot of things I hadn't seen before....

[steve]

Rust check has the right idea. Use their thicker product on exposed areas and their thin product on the inner body cavities and rocker panels and you can be sure of better coverage.