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Undercoating confusion

Discussion in '3rd Gen. Tacomas (2016+)' started by MaineTurd, Mar 10, 2021.

  1. Mar 10, 2021 at 5:45 AM
    #1
    MaineTurd

    MaineTurd [OP] New Member

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    Hello all,
    I’m brand new to the site and Tacomas. I just bought a ‘21 and am wondering what people are doing about undercoating. My dealership in Maine did not offer it in house and said Toyota did necessarily recommend any. With so many products out there, who knows what to do!
    Thanks much in advance.
     
  2. Mar 10, 2021 at 6:00 AM
    #2
    jdiru

    jdiru Well-Known Member

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    Use something like Fluid Film, Cosmoline or NHOU... Do it yourself or have a pro apply it for you.
    Toyota has still not resolved the frame rust issues even in the 3rd Gen. So they will rust and you will have to own the problem. Toyota won't really help you.
     
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  3. Mar 10, 2021 at 6:29 AM
    #3
    NorrinRadd

    NorrinRadd Well-Known Member

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    Wondering how often this needs to be reapplied and does that matter if you pay a "pro" to do it? Does it interfere with installing armor or sliders, as in, not allow bolts to fully tighten, etc?
     
  4. Mar 10, 2021 at 6:37 AM
    #4
    GrundleJuice

    GrundleJuice Well-Known Member

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    [S]Un-Molested[/S] Lightly Molested
    Most of the Corrosion Inhibitor type coatings will not interfere with fasteners or clearances, they are like a thin grease or thick oil or waxy shell depending what product. The rubberized undercoating stuff is not an inhibitor, it it intended the seal off the surface. Both have pros and cons. The thinner stuff like fluidfilm will require more reapplication than the thicker/waxy stuff like cosmoline or CRCs Heavy Duty Corrosion Inhibitor, how much so depends on conditions and things like rain/water on road, speed, etc. Some of the versions stay wet/oily so they can attract dust/dirty and accumulate, especially on vehicles that are lots of off road/dirt road miles. I would avoid penetrating corrosion inhibitors like ACF50 and Corrosion X. They are great for stopping galvanic cells and getting between sheet metal seams but they can also get into bolted or riveted joints and allow them to loosen up.
     
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  5. Mar 10, 2021 at 6:42 AM
    #5
    Kruuuzn

    Kruuuzn Well-Known Member

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  6. Mar 10, 2021 at 6:44 AM
    #6
    jdiru

    jdiru Well-Known Member

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    Once a year at a minimum.... if you live in a winter salt on the roads zone...
     
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  7. Mar 10, 2021 at 7:58 AM
    #7
    GrundleJuice

    GrundleJuice Well-Known Member

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    [S]Un-Molested[/S] Lightly Molested
    With the CRC Heavy Duty Corrosion Inhibitor, which seems very similar to cosmoline but might dry to a little harder shell, I have only had to do spot touchup once a year and it's usually where I've been working on things. Even the layer on the front of the LCAs were intact after a Michigan winter. The one downside to me is that it requires a solvent to remove it quickly and completely. Toluene or acetone works very well, and MEK does pretty good, too. Alcohol works, but requires more time and elbow grease.
     
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  8. Mar 10, 2021 at 8:02 AM
    #8
    MaineTurd

    MaineTurd [OP] New Member

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    Thanks for all the advice. Cosmoline it is.
     
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  9. Mar 10, 2021 at 8:05 AM
    #9
    Skydvrr

    Skydvrr IG: @kalopsianick

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    I'm a big fan of the CRC as well. Amazing how wet it is, until it dries, it's surprisingly thick. I wish I could find toluene, no one around me sells it.
     
  10. Mar 10, 2021 at 8:06 AM
    #10
    5nahalf

    5nahalf I build dumb things

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    In the 80s, BMW coated their engine bays with cosmoline, the dealers were to remove it during the pre-delivery inspections. Many dealers did not remove that stuff. Now 30 years and 256k miles later, my 1991 BMW convertible still has cosmoline on the engine and all over the engine bay. That stuff does not come off.
     
  11. Mar 10, 2021 at 8:13 AM
    #11
    zoo truck

    zoo truck Well-Known Member

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    Yep, toyota claimed they have meet their responsibility for manufacturing the truck and indicated its now my responsibility to maintain it including keeping the chassis washed periodically, especially during the winter if in the rust belt. Imo, cosmoline is the way to go on a clean new frame, unless you prefer to do it every year with products like fluid film. Both will work fine preventing rust.
     
  12. Mar 10, 2021 at 8:15 AM
    #12
    zoo truck

    zoo truck Well-Known Member

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    Bmw, and mercedes still use cosmoline today from what i've been told.
     
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  13. Mar 10, 2021 at 8:19 AM
    #13
    5nahalf

    5nahalf I build dumb things

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    After a number of years, and the baking on the engines, that shit doesnt not come off either
     
  14. Mar 10, 2021 at 11:34 AM
    #14
    zoo truck

    zoo truck Well-Known Member

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    Geez, you'd think they'd have enough brain's to coat the chassis first before installing the engine.:frusty:
     
  15. Mar 10, 2021 at 11:36 AM
    #15
    5nahalf

    5nahalf I build dumb things

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    Oh god no, they just pop the hood and hose that shit down. Look at any bmw e30 and you will see most of them have yellow engines.
     
  16. Mar 10, 2021 at 11:38 AM
    #16
    skidooboy

    skidooboy titanium plate tester

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    fluid film and woolwax, are very popular around here. I use both. Ski
     
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  17. Mar 10, 2021 at 2:01 PM
    #17
    GrundleJuice

    GrundleJuice Well-Known Member

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    [S]Un-Molested[/S] Lightly Molested
    Xylene is much easier to find and is a suitable substitute as long as the base material is ok with it. It's harmful to some plastics/rubbers and some one part paints (even after they cure), and may dull a polished paint/clear coat. It's safe on cured polyurethane paints. A google search for "Xylene compatibility" should get a list of materials it will damage.

    Edit:
    You can read a little more about toluene and xylene here. Just before halfway down.

    https://thefinishingstore.com/blogs/news/127174467-understanding-solvents-part-i
     
    Last edited: Mar 10, 2021
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  18. Mar 10, 2021 at 2:07 PM
    #18
    splitbolt

    splitbolt Well-Known Member

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    I thought it was there for shipping overseas; not necessarily a long term treatment. Don't they coat all painted exterior panels as well?
     
  19. Mar 10, 2021 at 2:10 PM
    #19
    Skydvrr

    Skydvrr IG: @kalopsianick

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    I wonder if xylene will thin shoe-goo. I wanna use shoe-goo for custom strain reliefs and label maker protectors.
     
  20. Mar 10, 2021 at 2:14 PM
    #20
    GrundleJuice

    GrundleJuice Well-Known Member

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    Is that the clear contact cement stuff? If so, it might not. I don't think it works great on synthetic adhesives. Worth a try if you have some, though.
     
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