Forgot to mix the epoxy primer

Discussion in 'Boatbuilding' started by mariobrothers88, Apr 26, 2022.

  1. mariobrothers88
    Joined: Sep 2020
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    Location: San Diego, CA

    mariobrothers88 Senior Member

    Hi guys I made a dumb mistake and forgot to mix the epoxy primer part a with part b and just applied part a to the boat. Now I have to remove it and paint the epoxy primer on again. The paint store recommended this paint removal agent but I tried it and it doesn't really work that well. Do you guys have any tips to remove paint? I was thinking of just sanding it but it will take a very long time. Any suggestions? Thanks in advance!!
     
  2. wet feet
    Joined: Nov 2004
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    Location: East Anglia,England

    wet feet Senior Member

    My condolences on having to do so much work to return to the point you were at before a moment's forgetfulness.I've never had a need to remove unmixed epoxy and can't offer definitive advice but I would begin by trying a hot air stripper on a small patch.My reasoning is that if one needs to break a bond then raising the temperature of the glue line to 95C is a good way to do so.You don't have a cured epoxy and it may be that simply softening the unmixed coating will allow a Skarsten scraper to remove the softened material.Considerable care will be needed to avoid digging the corners of the scraper in or you will be mixing some filler to make good the damage.There may be solvents that would soften the paint but I'm not keen on sharing the workspace with any that might be powerful enough to work.
     
  3. Blueknarr
    Joined: Aug 2017
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    Location: Colorado

    Blueknarr Senior Member

    Bummer

    Lots of rags and elbow grease.

    Mild acids (vinegar) usually work well with uncured epoxy and are usually less toxic than solvents from the paint store.
     
  4. fallguy
    Joined: Dec 2016
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    Location: usa

    fallguy Senior Member

    Acetone. No flames anywhere. Wear an organic mask or you'll get sick.

    Sometime lacquer thinner works.

    do not heat the boat or it will damage epoxy finishes
     
  5. AlanX
    Joined: Mar 2022
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    Location: Perth, Western Australia

    AlanX Senior Member

    I use white vinegar as if is skin/lungs friendly and cheap.
    It deactivates mixed (but still to set) epoxy (useful to know), but it still leaves a residue.
    Acetone works better but best to avoid if possible.
    So I would start with vinegar and finish off with acetone in your case

    AlanX
     
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  6. BlueBell
    Joined: May 2017
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    Location: Victoria BC Canada

    BlueBell . . . _ _ _ . . . _ _ _

    A scraper I would think for the bulk of it, but fortunately, I've never made this mistake, so I have no idea.
    Certainly a bummer.
    I'll bet you won't do that again.
    Good luck.
     
  7. DogCavalry
    Joined: Sep 2019
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    Location: Vancouver bc

    DogCavalry Senior Member

    I did it 3 times in a year. Each time,I figured the miserable ordeal would make me remember not to do it again. I'm starting to think 5 concussions is too many.
     
  8. BlueBell
    Joined: May 2017
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    Location: Victoria BC Canada

    BlueBell . . . _ _ _ . . . _ _ _

    How did you get it off?
    Same all three times?
     
  9. DogCavalry
    Joined: Sep 2019
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    Location: Vancouver bc

    DogCavalry Senior Member

    Unfortunately I hadn't read the advice about vinegar yet. I coated the area in cabosil to make a goo thick enough to scrape off, then used a drywall scraper to get as much as I could. Then more cabosil and scrape. I finished with acetone.
     
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  10. comfisherman
    Joined: Apr 2009
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    Location: Alaska

    comfisherman Senior Member

    Metal putty knife, loose wire wheel, lots of acetone and rags. No way around it being a mess and work. I've had the privilege of doing one of my own with a base layer and did a cleanup for someone else.
     

  11. DogCavalry
    Joined: Sep 2019
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    Location: Vancouver bc

    DogCavalry Senior Member

    Stiff wirebrushwas also very helpful.
     
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