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Sealing Your Tonneau Cover (pics)

Discussion in '3rd Gen. Tacomas (2016+)' started by Frogsauce, Dec 30, 2016.

  1. Dec 30, 2016 at 3:57 PM
    #1
    Frogsauce

    Frogsauce [OP] Well-Known Member

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    So I finally got warmer weather to try this in, and I tinkered with a few alternatives before I found one that seems to last. I have the TruXedo Lo-pro tonneau cover and I like how it fits, but as many of you have experienced, I got leaks around corners. I dusted the inside of the truck and drove it in the rain and then through a car wash and found where most of the water is coming in at.

    1st, and probably most, it's coming in through a large gap in the top corners near the cab. Not from the tonneau, but from the bed itself. 2nd, around the tailgate has a significant gap (this was more noticeable after the car wash).

    I tried silicone, gap seal, and flex shot but nothing would stick to the truck well enough. At last I tried Great Stuff (for Ponds) and it sticks in there really well.

    https://www.amazon.com/GREAT-STUFF-Stone-Insulating-Sealant/dp/B001AQ0FVC

    I just sprayed enough in the openings to fill the gap and then let it expand over the next few hours. I trimmed the excess and this is how it turned out:

    20161230_151715_Ink_LI.jpg
    20161230_151630.jpg

    I will clean it up and paint it late, or plastidip it.

    Next I used gorrilla tape (to go) to tape down the entire length of the rubber flap from the tonneau:

    20161230_151636.jpg

    It holds up in the rain just fine, and if it starts to peal I'll just put more down.

    Next I sealed the tailgate with Tailgate Seal (making sure my corners overlapped somewhat):

    https://www.amazon.com/gp/product/B00IPQWXZQ/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1

    20161230_151746.jpg
    20161230_151732.jpg

    And I dusted it down and tested it again. We didn't have rain, so I had to drive it through the carwash, which is probably a better test anyway. It only had a few drops of water in the bed from the sides and a few drops from the drain holes in the bottom of the bed.

    Overall I consider that a success.
     
    Wallbright and DrFunker like this.
  2. Dec 30, 2016 at 4:21 PM
    #2
    Frogsauce

    Frogsauce [OP] Well-Known Member

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    Also, after I paint or plastidip the great stuff I'll take pics of that too. It's not clean looking just cut like that.
     
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  3. Dec 31, 2016 at 8:53 PM
    #3
    Wallbright

    Wallbright Well-Known Member

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    I know yours is the Lo Pro but the new Truxedo TruXport ships with supplemental instructions and two pieces that fit on either side of the header to water proof it like you did. It wants you to take off the header though so I just shoved them down in there instead.
     
    Frogsauce [OP] likes this.
  4. Jan 1, 2017 at 1:52 AM
    #4
    monsterkx2fiddy

    monsterkx2fiddy Well-Known Member

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    Frogsauce [OP] likes this.
  5. Jan 1, 2017 at 2:35 AM
    #5
    NY Taco

    NY Taco Well-Known Member

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    Leer 180 Cap, Beat Sonic Navi By-Pass
    This is something I need to do, my cap leaks really bad from the two front corners.
     
  6. Jan 1, 2017 at 7:22 AM
    #6
    Frogsauce

    Frogsauce [OP] Well-Known Member

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    That's a great link, lots of options there and I'm sure some of that could probably be used for a tonneau as well.

    That's good news. I couldn't find it for sale separately, so I may call them and ask about it. I did find their tailgate seal though. http://www.truxedo.com/i-25817206-truxedo-truxseal.html#!year=2016||make=TOYOTA||model=TACOMA
     
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  7. Jan 1, 2017 at 11:39 AM
    #7
    Esto

    Esto Well-Known Member

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    I used shoegoo marine formula.Its clear ,used some closed cel black foam and then the shoegoo to seal it down.
     
  8. Jan 2, 2017 at 9:01 AM
    #8
    nhparrot

    nhparrot Well-Known Member

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    My tonneau cover (Access Original Roll-Up)has a rubber gasket mounted to the front rail under the cover assembly. I closed up the openings of two front corners of the bed by stuffing the hole with a small piece of rubber pipe insulation and covering the inside and outside with some black "snow & ice" duct tape. I also put an Access TailGate Seal at the tail gate end of the bed.
     
    Last edited: Jan 2, 2017
  9. Jan 2, 2017 at 10:48 AM
    #9
    Wallbright

    Wallbright Well-Known Member

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    I still had the instruction sheet with the part #:

    [​IMG] [​IMG]
     
  10. Jan 2, 2017 at 10:53 AM
    #10
    Frogsauce

    Frogsauce [OP] Well-Known Member

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    There is also a significant opening under that bed rail cap:

    Capture_Ink_LI.jpg

    That's where the expanding properties of great stuff came in handy. It filled in that whole area.
     
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  11. Jan 25, 2021 at 8:54 AM
    #11
    TBLTravy

    TBLTravy Well-Known Member

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    As for the front by the bulkhead corners, did you seal with that stuff from underneath or from the top down. I am having the same issue with my Lopro.
     
  12. Jan 25, 2021 at 8:57 AM
    #12
    TBLTravy

    TBLTravy Well-Known Member

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    Did you ever do this to your cover? How did it work out?
     
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  13. Jan 28, 2021 at 9:39 AM
    #13
    Deja

    Deja Well-Known Member

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    Thanks for the write-up
     
  14. Feb 19, 2021 at 7:49 AM
    #14
    mikeio

    mikeio New Member

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    I am having an issue at the tailgate.
    The cover does not sit flush on the tailgate, thus, creating a little space.
    I am not sure how to get the cover to fully sit flush on the tailgate.
    Any suggestions??
     
  15. Feb 19, 2021 at 9:08 AM
    #15
    NoVa TRD Sport

    NoVa TRD Sport Well-Known Member

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    Leer cap
    The OEM tonneau cover includes rubber plugs for the front corners of the bed. You can get these separately from Toyota for $30 apiece. (You also have to notch your side bed caps to install them.)

    Waterproofing an aftermarket tonneau cover is probably very similar to waterproofing a camper shell. When I installed my camper shell, I not only used those rubber plugs, but I put lots of silicone sealant under the front and side bed caps. (The source of many leaks is water splashing up from the back wheels through the open spaces between the outer fenders and the composite bed. It finds its way through the numerous holes under the bed caps. You need to seal inboard of the holes.)
     

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