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Leak prevention between cap and bed for 3-G Tacoma: Is There a "Best" way?

Discussion in '3rd Gen. Tacomas (2016+)' started by Idig63, May 8, 2017.

  1. May 8, 2017 at 10:16 AM
    #1
    Idig63

    Idig63 [OP] Well-Known Member

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    I've searched and read many threads on 3-G Tacos regarding water entering into the bed between the cap and the bed due to (faulty) design of the railcaps (especially at the front behind the cab). From what I've gathered, there have been some successes, but many non-successes, at making it "waterproof." At this point, I'm left understanding that it is either hit or miss making it waterproof.

    I will be getting a cap (Leer 100XR) installed next week. Before then, I'd like to do my best to waterproof the top of the bed/railcaps before the cap is installed.

    For those with caps/experience, is there an understood "best way" to achieve waterproofing that I may have missed?

    Thanks.
     
    BountyOR_VF2 likes this.
  2. May 8, 2017 at 10:22 AM
    #2
    mkivr32

    mkivr32 Well-Known Member

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    Having issues with my 100XR as well and would like to know the same thing. Mine seems to be leaking up front and at the rear. It seems like it wicks from the rear glass forward with the lower part of the headliner. I trimmed the carpet some since it was sticking out but still seems to leaks. I'm hesitant to bring it back to have them fix it since I'm sure they will just throw a shit load of caulking at it and would rather fix it correctly.
     
    Paris0514 likes this.
  3. May 8, 2017 at 10:43 AM
    #3
    0210

    0210 Well-Known Member

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    100XR? Been there, done that. May god have mercy on your soul.

    0. Use a butyl-based sealant, such as asphalt or roof sealant. Available at Home Depot and very cheap.
    1. Take off the front header rail. Pop out the rubber caps on both ends, seal them, then run bead of sealant UNDER the rail, then mount the rail back into original position.
    2. Fill the gaps on both ends of the rail as much as you can. In fact, overfill them to the sealant is a bit higher than the adjacent rail.
    3. If your cap will have a front removable window, it'll leak around the perimeter of the window.
    3.1. If the front window also has a slider, it'll leak in the slider.
    4. If your cap has windoors, they will leak around the perimeter.
    4.1. If your windoors are sliding variety, they will leak at the slider.
    4.2. Can you guess what the locks on your windoors will do? If you guessed "leak," you're a winner!
    5. Before installing the Leer canopy, take off your bedside caps (plastic ones along the top of the bed sides) and apply sealant underneath them. Also consider adding some thin (1/8") weatherproofing to act as padding between the cap and the bed, otherwise the cap will scratch the paint underneath it once the canopy is on.

    Fuckin' enjoy.
     
    Last edited: May 8, 2017
    Snowraizer, Gator352, sodaryl and 2 others like this.
  4. May 8, 2017 at 11:22 AM
    #4
    oldschoolczar

    oldschoolczar Well-Known Member

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    Somebody mentioned this stuff and I'm about to order some:

    https://www.amazon.com/gp/product/B001AQ0FVC/ref=oh_aui_detailpage_o05_s00?ie=UTF8&psc=1

    Just had the 100xr installed 3 weeks ago. Its actually fairly water tight. The only spot I get leaks is at the corners at the front of the bed. I can see a small gap so I'm hoping this'll seal it right up. It'll probably be a mess if I ever remove the topper but not sure I will. Just gonna buy a piece o shit trailer to haul mulch, etc.

    Anyway, I also notice some larger gaps where the topper back window meets the tailgate. Amazingly these don't seem to leak so I'll probably just leave it. Weve had a couple heavy rainstorms so I'm hoping these won't leak much in the future.
     
  5. May 8, 2017 at 11:37 AM
    #5
    Lt. Dangle

    Lt. Dangle Thinks skiploder needs a hug

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    stuff
    When I had my ARE V series installed, a part called a "Tacoma bed gasket" was used and I have no leaks. I have no carpet so I don't have to worry about wicking, but it seems there is a part missing on some cap installs.
     
    EagleUSMCRet likes this.
  6. May 8, 2017 at 11:41 AM
    #6
    smitty99

    smitty99 I also bought a 4Runner

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  7. May 8, 2017 at 11:49 AM
    #7
    trdacevedo43

    trdacevedo43 Well-Known Member

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    Great product to use
     
    oldschoolczar likes this.
  8. May 8, 2017 at 11:49 AM
    #8
    GORUCKtaco506

    GORUCKtaco506 Well-Known Member

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    ARE cx shell with windoors, carpeted sleeping platform, red LED map lights, LED vanity lights, tailgate vinyl inserts, glove box vinyl inserts, dog ramp, blacked front grill and white emblem, blacked badges, debadged tailgate.
    I got an ARE cx installed and they did a great job on sealing around the rails. I was having leaks come in from the front corners, right under the rails. I just put some black caulking in the corners and spread it with a putty knife. Haven't found any other leaks yet, good luck.
     
  9. May 8, 2017 at 2:35 PM
    #9
    cascadetaco

    cascadetaco Toyota Addict

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    smitty99 likes this.
  10. May 8, 2017 at 2:38 PM
    #10
    smitty99

    smitty99 I also bought a 4Runner

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    Yeah that 5200 marine sealant is no joke:rofl:
     
  11. May 8, 2017 at 2:38 PM
    #11
    EatSleepTacos

    EatSleepTacos MOBTOWN OFFROAD AMBASSADOR

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  12. May 8, 2017 at 5:38 PM
    #12
    oldschoolczar

    oldschoolczar Well-Known Member

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    Well shit, got to test 'er out pretty good today. Not quite as watertight as I thought:

    IMG_3587.jpg
     
    BlakeM likes this.
  13. May 8, 2017 at 6:27 PM
    #13
    opentang

    opentang you're doing a good job

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    These plugs are helpful, 99.9% dry with my Leer 100XQ

    https://www.tacomaworld.com/threads/rubber-plugs-for-gaps-in-bed-rail-available-now.420884/
     
    Idig63 [OP] likes this.
  14. May 8, 2017 at 7:30 PM
    #14
    0210

    0210 Well-Known Member

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    I used that product after it was recommended here and I wouldn't do it again. VERY difficult to cleanly remove. And when it dries, it's a very hard, plastic-like substance. It's better to use something that'll still be flexible and somewhat soft.
     
    oldschoolczar likes this.
  15. May 8, 2017 at 7:57 PM
    #15
    Go Fish

    Go Fish Well-Known Member

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    Mine doesn't leak in any of those places. Otherwise there is some good advise in that post.

    My installer used what I think is referred to as dum dum. It's a non hardening sealer kind of like black putty. They didn't seal under the side rails and I have some leakage there. I had some drips at the front corners and I was able to squish the sealer in there better. So far so good.
     
    oldschoolczar likes this.
  16. May 8, 2017 at 8:09 PM
    #16
    GPsevinSixx

    GPsevinSixx Well-Known Member

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    This is "dum dum" or "elepahnt snot" as we called it before in the car audio industry and dealerships. Made by 3M. Works well for all sorts of stuff, but a pain to clean up. Is this the stuff @0210 was referring to also?

    https://www.amazon.com/3M-08578-Black-Strip-Calk/dp/B000PEZ1L4
     
  17. May 8, 2017 at 8:22 PM
    #17
    oldschoolczar

    oldschoolczar Well-Known Member

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    GPsevinSixx likes this.
  18. May 10, 2017 at 4:20 PM
    #18
    Idig63

    Idig63 [OP] Well-Known Member

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    Thanks everyone for your input into this thread.
    I'll post what I end up doing for leak prevention and how it worked (if at all) :rofl:
     
  19. Sep 3, 2018 at 10:34 AM
    #19
    jtom12

    jtom12 Member

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    Hey guys, I am in the market for a bed cap, I own a 2018 double cab 5 ft bed. My top priority is having a waterproof bed for storage as I only have the back seat at the moment. Is there a brand that tends to have less leaking? I have heard snugtop is better than most, it is also more expensive than other brands. It seems that the leaking is hit or miss and the design of the bed itself and the quality of the installation are also major factors for leaking. I dont mind spending the money for a top quality bed cap but if it leaks I might as well just keep using my tonneau cover. Any advice would be appreciated!
     
  20. Oct 12, 2018 at 10:24 PM
    #20
    Mjkovalsky

    Mjkovalsky Member

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