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POR-15 take 2

Discussion in '1st Gen. Tacomas (1995-2004)' started by QMEDJoe, Mar 18, 2019.

  1. Mar 18, 2019 at 3:53 PM
    #1
    QMEDJoe

    QMEDJoe [OP] Proverbs 3:5-6

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    I purchased a pair of rock sliders several months ago and threw a couple of coats of POR-15 on them. I noticed not too long after that the POR-15 started coming off in sheets. I removed all of it and let them sit bare metal for a couple of months as I was away on business. I knocked off the loose rust with a green scrubby pad and washed the sliders in soap+water. I let them dry for a couple of hours, wiped them down with a clean dry rag and applied the POR-15. From what I’ve read, it should bond pretty well to the rusted metal.

    AE88C0D8-AA41-4807-898F-2867CD47C885.jpg
    1A78B99B-7DE4-4A39-87C2-2CF239AE0D93.jpg
    F0D713D6-649A-488A-AC66-BDF4AE8FA84D.jpg
    828EC2F4-E058-4E46-AA79-3E140E2428E3.jpg
     
    GQ7227 and cruiserguy like this.
  2. Mar 18, 2019 at 3:59 PM
    #2
    hemitruk

    hemitruk Old man , young boi truk

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    Need to top coat . No protection from sun . They recomment if going to top coat when its alittle tacky yet to hit with dust coat of primmer so top coat has some thing to bite too.
    Used por 15 before love it .
     
    Last edited: Mar 20, 2019
  3. Mar 18, 2019 at 3:59 PM
    #3
    hemitruk

    hemitruk Old man , young boi truk

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    Looks nice :thumbsup:
     
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  4. Mar 20, 2019 at 5:28 PM
    #4
    Newfiebruh

    Newfiebruh Well-Known Member

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    POR15 fails if theres no top coat.
     
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  5. Mar 20, 2019 at 5:53 PM
    #5
    rj15tacoma

    rj15tacoma Well-Known Member

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    Also, I used their metal prep and degreaser for my control arms and they still look perfect after 1 year. Take your time prepping and yeah you'll need a top coat to protect it from the sun :)
     
    xxTacocaTxx likes this.
  6. Mar 20, 2019 at 6:53 PM
    #6
    QMEDJoe

    QMEDJoe [OP] Proverbs 3:5-6

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    I have a top coat. I sprayed the oem black over it! :thumbsup:
     
  7. Mar 20, 2019 at 6:54 PM
    #7
    QMEDJoe

    QMEDJoe [OP] Proverbs 3:5-6

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    Makes sense. The part of the rock sliders that weren't exposed to the sun was still pretty well protected.
     
    Last edited: Mar 22, 2019
    cruiserguy and Newfiebruh like this.
  8. Mar 20, 2019 at 6:56 PM
    #8
    boogie3478

    boogie3478 Tacomaholic & Hollywood

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    Prep prep prep and then prep some more.
     
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  9. Mar 20, 2019 at 8:07 PM
    #9
    otis24

    otis24 Hard Shell Taco

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    I’m planning on using POR15 on my truck’s frame and as much as I can this summer. From what I’ve read it’s orerty amazing stuff.
     
    QMEDJoe [OP] likes this.
  10. Mar 21, 2019 at 11:22 AM
    #10
    QMEDJoe

    QMEDJoe [OP] Proverbs 3:5-6

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    As long as there is rust it will bond to it. My first application didn’t go so well. I did everything I was suppose to as far as applying it except put a top coat on it. The slider that was most exposed to the sun didn’t last very long.
     
    Last edited: Mar 22, 2019
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  11. Mar 21, 2019 at 11:25 AM
    #11
    otis24

    otis24 Hard Shell Taco

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    I know you cleaned it but did you use the POR degreaser and, I suppose more importantly, the metal treatment.

    I have a thin layer of surface rust pretty much all over.
     
  12. Mar 21, 2019 at 11:27 AM
    #12
    JdevTac

    JdevTac Bawnjourno

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    Did you use their metal prep stuff?
     
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  13. Mar 21, 2019 at 11:27 AM
    #13
    Newfiebruh

    Newfiebruh Well-Known Member

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    None of that would have helped, it chemically degrades when exposed to UV rays. If the area sees any sun it has to be top coated, its not optional.
     
  14. Mar 21, 2019 at 11:29 AM
    #14
    JdevTac

    JdevTac Bawnjourno

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    It shouldn’t peel off in sheets though. Sounds more like a prep thing. If it’s UV degraded then it just fades and turns to crap.
     
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  15. Mar 21, 2019 at 11:29 AM
    #15
    otis24

    otis24 Hard Shell Taco

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    I know that but I was referring to the surface prep done to the sliders prior to application.

    Edit: Like Jdevtac said above.
     
  16. Mar 21, 2019 at 11:29 AM
    #16
    Newfiebruh

    Newfiebruh Well-Known Member

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    Nope its loses its bonding ability and breaks in sheets. This isnt normal paint.
     
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  17. Mar 21, 2019 at 11:33 AM
    #17
    otis24

    otis24 Hard Shell Taco

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    Just did a quick search. It sounds like UV causes it to break down and lose it's bond with the rust under it and then it fall apart and just comes off.

    Another example of it not being at all like normal paint is that it cures faster with more humidity to a point.
     
  18. Mar 21, 2019 at 11:36 AM
    #18
    JdevTac

    JdevTac Bawnjourno

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    Have you had this happen personally? I’m not questioning what you are saying just curious.
     
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  19. Mar 21, 2019 at 11:37 AM
    #19
    JdevTac

    JdevTac Bawnjourno

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    It’s essentially super glue.
     
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  20. Mar 21, 2019 at 11:39 AM
    #20
    Newfiebruh

    Newfiebruh Well-Known Member

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    Exactly, the composition of POR15 is pretty interesting, it has things in it like titanium dioxide and isocynaic acid etc. Most of it is classified as "trade secrets" but yeah, once exposed to UV rays decomposition is pretty rapid as the "paint" undergoes a chemical reaction due to the energy from the sun.
     
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