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epoxy primer question re-run

Discussion in 'The Hokey Ass Message Board' started by garagebuilt51, Jan 17, 2013.

  1. garagebuilt51
    Joined: May 4, 2010
    Posts: 69

    garagebuilt51
    Member

    i read 4-5 threads about having rust develop under primer cause it wasnt painted over soon enough. i had this happen with 2k primer and now know why. what im wondering is epoxy dtm any different? looking to clean up the window frames and prime before i install glass but it will be garage kept/ drove for a year or so unpainted. am i waisting time and paint doing the rest of the roof?
     
  2. cured epoxy primer will protect the metal. i am not sure that answers the question?
     
  3. garagebuilt51
    Joined: May 4, 2010
    Posts: 69

    garagebuilt51
    Member

    maybe not? just saw people saying it can get moisture under it if its not top coated. i want to know if epoxy will do it oj just 2k
     
  4. 63 Avanti 3137
    Joined: Dec 23, 2010
    Posts: 160

    63 Avanti 3137
    Member

    I believe it has to do with the polyester primers absorbing moisture over time if they aren't top coated or 'sealed'. Good Epoxy primers are water proof and seal the metal. I have a photo of a repair from over twenty years ago that developed rust between the filler and the metal that I only found by stripping it down.
     
  5. Deeznuts
    Joined: Jul 12, 2008
    Posts: 31

    Deeznuts
    Member

    2K primers will absorb moisture if not top coated
     
  6. Hotrodbuilderny
    Joined: Mar 20, 2009
    Posts: 1,646

    Hotrodbuilderny
    Member

    My Falcon had an Epoxy primer on it for 8 years it sat out all year rain, snow, etc.I can't speak for anyone else, but I had no problem.
     
  7. 345winder
    Joined: Oct 27, 2010
    Posts: 1,059

    345winder
    BANNED

    my rule of thumb,,,,if you have bare metal, the best thing to do is epoxy prime it that day,,if it sits in bare metal for more than a day, metal prep it with dx579 first, then epoxy it.....l
     
  8. chopolds
    Joined: Oct 22, 2001
    Posts: 6,313

    chopolds
    Member
    from howell, nj
    1. Kustom Painters

    Epoxy primer is NOT a topcoat, and WILL eventually degrade. Rust will form underneath. You might not see it, but it will be there. When that will happen is anyone's guess. What brand, how many coats, severity of the weather it sees, humidity, etc. all play a part in how quickly it degrades. 5 coats of good stuff in SoCal might last years, but outdoors in the NorthEast, might only be a year or less.
    You'd be surprised at what you will find UNDER paint or primer that, on the outside, looks OK.
     
  9. garagebuilt51
    Joined: May 4, 2010
    Posts: 69

    garagebuilt51
    Member

    thanks i think im gonna do the whole roof since there is already rust where the old paint delaminated. ill just go back to bare metal when im ready to topcoat.
     

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